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75-961: The Research Designs & Standards Organisation (RDSO) is the research and development and railway technical specification development organisation under the Ministry of Railways of the Government of India , which functions as a technical adviser and consultant to the Railway Board , the Zonal Railways, the Railway Production Units, RITES , RailTel and Ircon International in respect of design and standardization of railway equipment and problems related to railway construction, operations and maintenance. To enforce standardization and co-ordination between various railway systems in British India,

150-570: A bill of materials . This type of specification is a collaborative effort between a specification writer and a quantity surveyor . This approach is unusual in North America, where each bidder performs a quantity survey on the basis of both drawings and specifications. In many countries on the European continent, content that might be described as "specifications" in the United States are covered under

225-412: A functional specification (also, functional spec or specs or functional specifications document (FSD) ) is the set of documentation that describes the behavior of a computer program or larger software system . The documentation typically describes various inputs that can be provided to the software system and how the system responds to those inputs. Web services specifications are often under

300-425: A locking bed is constructed, consisting of steel bars forming a grid. The levers that operate switches , derails , signals or other appliances are connected to the bars running in one direction. The bars are constructed so that if the function controlled by a given lever conflicts with that controlled by another lever, mechanical interference is set up in the cross locking between the two bars, in turn preventing

375-674: A "Structured Product Label" which drug manufacturers must by mandate use to submit electronically the information on a drug label. Recently, the ISO has made some progress in the area of food and drug standards and formal specifications for data about regulated substances through the publication of ISO 11238. In many contexts, particularly software, specifications are needed to avoid errors due to lack of compatibility, for instance, in interoperability issues. For instance, when two applications share Unicode data, but use different normal forms or use them incorrectly, in an incompatible way or without sharing

450-432: A control lever may be moved into a position which would release other levers, a signal must be received from the field element that it has actually moved into the position requested. The locking bed shown is for a GRS power interlocking machine. Interlockings effected purely electrically (sometimes referred to as all-electric ) consist of complex circuitry made up of relays in an arrangement of relay logic that ascertain

525-411: A government or business contract. In engineering , manufacturing , and business , it is vital for suppliers , purchasers , and users of materials, products, or services to understand and agree upon all requirements. A specification may refer to a standard which is often referenced by a contract or procurement document, or an otherwise agreed upon set of requirements (though still often used in

600-402: A major investment has been made in actually implementing the design. An alternative approach is to use provably correct refinement steps to transform a specification into a design, and ultimately into an actual implementation, that is correct by construction. In (hardware, software, or enterprise) systems development, an architectural specification is the set of documentation that describes

675-639: A minimum set of interoperability specification, errors and data loss can result. For example, Mac OS X has many components that prefer or require only decomposed characters (thus decomposed-only Unicode encoded with UTF-8 is also known as "UTF8-MAC"). In one specific instance, the combination of OS X errors handling composed characters, and the samba file- and printer-sharing software (which replaces decomposed letters with composed ones when copying file names), has led to confusing and data-destroying interoperability problems. Applications may avoid such errors by preserving input code points, and normalizing them to only

750-488: A move to "greater use of performance and commercial specifications and standards" was to be introduced, which Perry saw as "one of the most important actions that [the Department of Defense] should take" at that time. The following British standards apply to specifications: A design/product specification does not necessarily prove a product to be correct or useful in every context. An item might be verified to comply with

825-437: A national government (including its different public entities, regulatory agencies , and national laboratories and institutes), a professional association (society), a purpose-made standards organization such as ISO , or vendor-neutral developed generic requirements. It is common for one organization to refer to ( reference , call out , cite ) the standards of another. Voluntary standards may become mandatory if adopted by

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900-1130: A new crashworthy design of 4500 HP WDG4 locomotive incorporating new technology to improve dynamic braking and attain significant fuel savings. Development of Drivers’ Vigilance Telemetric Control System which directly measures and analyses variations in biometric parameters to determine the state of alertness of the driver. Development of Kavach . Development of Computer Aided Drivers Aptitude test equipment for screening high-speed train drivers for Rajdhani/Shatabdi Express trains to evaluate their reaction time, form perception, vigilance and speed anticipation. Assessment of residual fatigue life of critical railway components like rail, rail weld, wheels, cylinder head, OHE mast, catenary wire, contact wire, wagon components, low components, etc. to formulate remedial actions. Modification of specification of Electric Lifting Barrier to improve its strength and reliability. Design and development of modern fault tolerant, fail-safe, maintainer friendly Electronic Interlocking system. Development of 4500 HP Hotel Load Locomotive to provide clean and noise-free power supply to coaches from

975-551: A specific list of products, or "open" allowing for substitutions made by the constructor. Most construction specifications are a combination of performance-based and proprietary types, naming acceptable manufacturers and products while also specifying certain standards and design criteria that must be met. While North American specifications are usually restricted to broad descriptions of the work, European ones and Civil work can include actual work quantities, including such things as area of drywall to be built in square meters, like

1050-494: A specific material type (concrete) or a work product (steel door) of the construction work. A specific material may be covered in several locations, depending on the work result: stainless steel (for example) can be covered as a sheet material used in flashing and sheet Metal in division 07; it can be part of a finished product, such as a handrail, covered in division 05; or it can be a component of building hardware, covered in division 08. The original listing of specification divisions

1125-402: A specification or stamped with a specification number: this does not, by itself, indicate that the item is fit for other, non-validated uses. The people who use the item ( engineers , trade unions , etc.) or specify the item ( building codes , government, industry, etc.) have the responsibility to consider the choice of available specifications, specify the correct one, enforce compliance, and use

1200-455: A total of 1,864 interlocking levers, were in use on 13 North American railroads. This type of system would remain one of two viable competing systems into the future, although it did have the disadvantage of needing extra single-use equipment and requiring high maintenance. Interlockings using electric motors for moving switches and signals became viable in 1894, when Siemens in Austria installed

1275-460: Is a mathematical description of software or hardware that may be used to develop an implementation . It describes what the system should do, not (necessarily) how the system should do it. Given such a specification, it is possible to use formal verification techniques to demonstrate that a candidate system design is correct with respect to that specification. This has the advantage that incorrect candidate system designs can be revised before

1350-523: Is a common early part of engineering design and product development processes in many fields. A functional specification is a kind of requirement specification, and may show functional block diagrams. A design or product specification describes the features of the solutions for the Requirement Specification, referring to either a designed solution or final produced solution. It is often used to guide fabrication/production. Sometimes

1425-553: Is a process for dealing with observations that are out-of-specification. The United States Food and Drug Administration has published a non-binding recommendation that addresses just this point. At the present time, much of the information and regulations concerning food and food products remain in a form which makes it difficult to apply automated information processing, storage and transmission methods and techniques. Data systems that can process, store and transfer information about food and food products need formal specifications for

1500-417: Is an arrangement of signal apparatus that prevents conflicting movements through an arrangement of tracks such as junctions or crossings. In North America, a set of signalling appliances and tracks interlocked together are sometimes collectively referred to as an interlocking plant or just as an interlocking . An interlocking system is designed so that it is impossible to display a signal to proceed unless

1575-708: Is assisted by an Additional Director General and 23 Sr. Executive Directors and Executive Directors, who are in charge of the 27 directorates: Bridges and Structures, the Centre for Advanced Maintenance Technology (CAMTECH), Carriage, Geotechnical Engineering, Testing, Track Design, Medical, EMU & Power Supply, Engine Development, Finance & Accounts, Telecommunication, Quality Assurance, Personnel, Works, Psycho-Technical, Research, Signal, Wagon Design, Electric Locomotive, Stores, Track Machines & Monitoring, Traction Installation, Energy Management, Traffic, Metallurgical & Chemical, Motive Power and Library & Publications. All

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1650-560: Is currently less fruitful and not yet put forward as an urgent agenda due to the tight restrictions of regional or national constitution. Specifications and other standards can be externally imposed as discussed above, but also internal manufacturing and quality specifications. These exist not only for the food or pharmaceutical product but also for the processing machinery , quality processes, packaging , logistics ( cold chain ), etc. and are exemplified by ISO 14134 and ISO 15609. The converse of explicit statement of specifications

1725-414: Is not covered by the above standards , it can be evaluated by the additional source of pharmacopoeias from other nations, from industrial specifications, or from a standardized formulary such as A similar approach is adopted by the food manufacturing, of which Codex Alimentarius ranks the highest standards, followed by regional and national standards. The coverage of food and drug standards by ISO

1800-528: Is owned by the Royal Institute of British Architects (RIBA) through their commercial group RIBA Enterprises (RIBAe). NBS master specifications provide content that is broad and comprehensive, and delivered using software functionality that enables specifiers to customize the content to suit the needs of the project and to keep up to date. UK project specification types fall into two main categories prescriptive and performance. Prescriptive specifications define

1875-634: The London and North Western Railway alone. The first experiment with mechanical interlocking in the United States took place in 1875 by J. M. Toucey and William Buchanan at Spuyten Duyvil Junction in New York on the New York Central and Hudson River Railroad (NYC&HRR). At the time, Toucey was General Superintendent and Buchanan was Superintendent of Machinery on the NYC&;HRR. Toucey and Buchanan formed

1950-513: The federal government and its agencies stipulates that a copy of the drawings and specifications must be kept available on a construction site. Specifications in Egypt form part of contract documents. The Housing and Building National Research Center ( HBRC ) is responsible for developing construction specifications and codes. The HBRC has published more than 15 books which cover building activities like earthworks , plastering, etc. Specifications in

2025-720: The structure , behavior , and more views of that system . A program specification is the definition of what a computer program is expected to do. It can be informal , in which case it can be considered as a user manual from a developer point of view, or formal , in which case it has a definite meaning defined in mathematical or programmatic terms. In practice, many successful specifications are written to understand and fine-tune applications that were already well-developed, although safety-critical software systems are often carefully specified prior to application development. Specifications are most important for external interfaces that must remain stable. In software development ,

2100-421: The 1980s when solid state interlocking and control systems began to replace the older relay plants of all types. Modern interlockings (those installed since the late 1980s) are generally solid state , where the wired networks of relays are replaced by software logic running on special-purpose control hardware. The fact that the logic is implemented by software rather than hard-wired circuitry greatly facilitates

2175-416: The 50 division format, which was adopted in both the United States and Canada starting in 2004. The 16 division format is no longer considered standard, and is not supported by either CSI or CSC, or any of the subscription master specification services, data repositories, product lead systems, and the bulk of governmental agencies. The United States' Federal Acquisition Regulation governing procurement for

2250-657: The Construction Specifications Institute and the Registered Specification Writer (RSW) through Construction Specifications Canada. Specification writers may be separate entities such as sub-contractors or they may be employees of architects, engineers, or construction management companies. Specification writers frequently meet with manufacturers of building materials who seek to have their products specified on upcoming construction projects so that contractors can include their products in

2325-585: The Indian Railway Conference Association (IRCA) was set up in 1902. It was followed by the establishment of the Central Standards Office (CSO) in 1930, for preparation of designs, standards and specifications. However, till India's independence in 1947, most of the designs and manufacture of railway equipment was entrusted to foreign consultants. After independence, a new organisation called Railway Testing and Research Centre (RTRC)

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2400-542: The Ministry of Railways with its headquarters at Manak Nagar, Lucknow . The status of RDSO was changed from an "Attached Office" to a "Zonal Railway" on 1 January 2003, to give it greater flexibility and a boost to the research and development activities. RDSO is headed by the Director-General who ranks equivalent to the general manager of a Zonal Railway. The present Director General is Sanjeev Bhutani The Director-General

2475-667: The Toucey and Buchanan Interlocking Switch and Signal Company in Harrisburg, Pennsylvania in 1878. The first important installations of their mechanism were on the switches and signals of the Manhattan Elevated Railroad Company and the New York Elevated Railroad Company in 1877–78. Compared to Saxby's design, Toucey and Buchanans' interlocking mechanism was more cumbersome and less sophisticated, and so

2550-588: The UK are part of the contract documents that accompany and govern the construction of a building. They are prepared by construction professionals such as architects , architectural technologists , structural engineers , landscape architects and building services engineers . They are created from previous project specifications, in-house documents or master specifications such as the National Building Specification (NBS). The National Building Specification

2625-523: The United States and are usually subscription based. Specifications can be either "performance-based", whereby the specifier restricts the text to stating the performance that must be achieved by the completed work, "prescriptive" where the specifier states the specific criteria such as fabrication standards applicable to the item, or "proprietary", whereby the specifier indicates specific products, vendors and even contractors that are acceptable for each workscope. In addition, specifications can be "closed" with

2700-517: The United States and updated every two years. While there is a tendency to believe that "specifications overrule drawings" in the event of discrepancies between the text document and the drawings, the actual intent must be made explicit in the contract between the Owner and the Contractor. The standard AIA (American Institute of Architects) and EJCDC (Engineering Joint Contract Documents Committee) states that

2775-512: The ability to make modifications when needed by reprogramming rather than rewiring. In many implementations, this vital logic is stored as firmware or in ROM that cannot be easily altered to both resist unsafe modification and meet regulatory safety testing requirements. As display technology improved, the hard wired physical devices could be updated with visual display units (computer monitors), which allowed changes in field equipment be represented to

2850-478: The application's preferred normal form for internal use. Such errors may also be avoided with algorithms normalizing both strings before any binary comparison. However errors due to file name encoding incompatibilities have always existed, due to a lack of minimum set of common specification between software hoped to be inter-operable between various file system drivers, operating systems, network protocols, and thousands of software packages. A formal specification

2925-524: The building code or municipal code. Civil and infrastructure work in the United States often includes a quantity breakdown of the work to be performed as well. Although specifications are usually issued by the architect 's office, specification writing itself is undertaken by the architect and the various engineers or by specialist specification writers. Specification writing is often a distinct professional trade, with professional certifications such as "Certified Construction Specifier" (CCS) available through

3000-455: The conditions of a system or object after years of operation, including the effects of wear and maintenance (configuration changes). Specifications are a type of technical standard that may be developed by any of various kinds of organizations, in both the public and private sectors. Example organization types include a corporation , a consortium (a small group of corporations), a trade association (an industry-wide group of corporations),

3075-445: The conflicting lever movement from being made. In purely mechanical plants, the levers operate the field devices, such as signals, directly via a mechanical rodding or wire connection. The levers are about shoulder height since they must supply a mechanical advantage for the operator. Cross locking of levers was effected such that the extra leverage could not defeat the locking (preliminary latch lock). The first mechanical interlocking

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3150-565: The design, and little saving of labour was achieved. The inventors of the hydro-pneumatic system moved forward to an electro-pneumatic system in 1891 and this system, best identified with the Union Switch & Signal Company, was first installed on the Chicago and Northern Pacific Railroad at its drawbridge across the Chicago River . By 1900, 54 electro-pneumatic interlocking plants, controlling

3225-627: The directorates except Defence Research are located in Lucknow . Trail run of world's first triple stack container train. Design and specification of 12,000 hp WAG-11 electric locomotive. Design and specification of Vande Bharat Design and development of dual purpose Double Decker Express for cargo as well as passenger. Design and specification of WDAP-5 Design and specification of Utkrisht Double Decker Development of design & specification of WAG-12 Development of Double Decker Express Design of WAGC3 locomotive Development of

3300-651: The drawings and specifications are complementary, together providing the information required for a complete facility. Many public agencies, such as the Naval Facilities Command (NAVFAC) state that the specifications overrule the drawings. This is based on the idea that words are easier for a jury (or mediator) to interpret than drawings in case of a dispute. The standard listing of construction specifications falls into 50 Divisions , or broad categories of work types and work results involved in construction. The divisions are subdivided into sections, each one addressing

3375-463: The estimates leading to their proposals. In February 2015, ArCHspec went live, from ArCH (Architects Creating Homes), a nationwide American professional society of architects whose purpose is to improve residential architecture. ArCHspec was created specifically for use by licensed architects while designing SFR (Single Family Residential) architectural projects. Unlike the more commercial CSI/CSC (50+ division commercial specifications), ArCHspec utilizes

3450-953: The first such interlocking at Přerov (now in the Czech Republic). Another interlocking of this type was installed in Westend near Berlin in 1896. In North America, the first installation of an interlocking plant using electric switch machines was at Eau Claire, Wisconsin on the Chicago, St. Paul, Minneapolis and Omaha Railway in 1901, by General Railway Signal Company (GRS, now a unit of Alstom , headquartered in Levallois-Perret , near Paris). By 1913, this type system had been installed on 83 railroads across 35 US states and Canadian provinces, in 440 interlocking plants using 21,370 levers. Interlockings can be categorized as mechanical, electrical (electro-mechanical or relay -based), or electronic/ computer-based . In mechanical interlocking plants,

3525-477: The fundamental principles of interlocking include: Railway interlocking is of British origin, where numerous patents were granted. In June 1856, John Saxby received the first patent for interlocking switches and signals. In 1868, Saxby (of Saxby & Farmer) was awarded a patent for what is known today in North America as “preliminary latch locking”. Preliminary latch locking became so successful that by 1873, 13,000 mechanical locking levers were employed on

3600-631: The indigenous fastening system (BLT-IFS). Design and Development of Rail Free Fastening (RFF) for Girder Bridges. Reduction in de-stressing temperature in LWR with the use of wider and heavier sleepers. Carrying Long Welded Rails through Points and Crossings. Laying of Long Welded Rails in Sharp curve of less than 440 m radius. Design and development of 25T Axle load bogie for different wagons. Specification (technical standard) There are different types of technical or engineering specifications (specs), and

3675-734: The interlocking plant. The first NX installation was in 1937 at Brunswick on the Cheshire Lines , UK. The first US installation was on the New York Central Railroad (NYCRR) at Girard Junction, Ohio in 1937. Another NYCRR installation was on the main line between Utica, New York and Rochester, New York , and this was quickly followed up by three installations on the New York City Subway 's IND Fulton Street Line in 1948. Other NX style systems were implemented by other railroad signal providers. For example, Union Route (UR)

3750-467: The item correctly. Validation of suitability is necessary. Public sector procurement rules in the European Union and United Kingdom require non-discriminatory technical specifications to be used to identify the purchasing organisation's requirements. The rules relating to public works contracts initially prohibited "technical specifications having a discriminatory effect" from 1971; this principle

3825-445: The large mechanical levers of previous systems being replaced by buttons, switches or toggles on a panel or video interface. Such an interlocking may also be designed to operate without a human operator. These arrangements are termed automatic interlockings , and the approach of a train sets its own route automatically, provided no conflicting movements are in progress. GRS manufactured the first all-relay interlocking system in 1929. It

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3900-424: The locomotive to eliminate the existing generator car of Garib Rath express trains. Field trials conducted for electric locomotive hauling Rajdhani/Shatabdi express trains with Head On Generation (HOG) system to provide clean and noise-free power supply to end on coaches. Development of WiMAX technology to provide internet access to the passengers in running trains. Design and Development of Ballastless Track with

3975-458: The more concise 16 traditional Divisions, plus a Division 0 (Scope & Bid Forms) and Division 17 (low voltage). Many architects, up to this point, did not provide specifications for residential designs, which is one of the reasons ArCHspec was created: to fill a void in the industry with more compact specifications for residential projects. Shorter form specifications documents suitable for residential use are also available through Arcom, and follow

4050-406: The organisation's current corporate objectives or priorities. Sometimes a guide or a standard operating procedure is available to help write and format a good specification. A specification might include: Specifications in North America form part of the contract documents that accompany and govern the drawings for construction of building and infrastructure projects. Specifications describe

4125-473: The quality and performance of building materials, using code citations and published standards, whereas the drawings or building information model (BIM) illustrates quantity and location of materials. The guiding master document of names and numbers is the latest edition of MasterFormat . This is a consensus document that is jointly sponsored by two professional organizations: Construction Specifications Canada and Construction Specifications Institute based in

4200-414: The rather voluminous commercial style of specifications too lengthy for most residential projects and therefore either produce more abbreviated specifications of their own or use ArCHspec (which was specifically created for residential projects). Master specification systems are available from multiple vendors such as Arcom, Visispec, BSD, and Spectext. These systems were created to standardize language across

4275-495: The representations of data about food and food products in order to operate effectively and efficiently. Development of formal specifications for food and drug data with the necessary and sufficient clarity and precision for use specifically by digital computing systems have begun to emerge from some government agencies and standards organizations: the United States Food and Drug Administration has published specifications for

4350-476: The requirements using generic or proprietary descriptions of what is required, whereas performance specifications focus on the outcomes rather than the characteristics of the components. Specifications are an integral part of Building Information Modeling and cover the non-geometric requirements. Pharmaceutical products can usually be tested and qualified by various pharmacopoeias . Current existing pharmaceutical standards include: If any pharmaceutical product

4425-403: The route manually. The NX system allowed an operator looking at the diagram of a complicated junction to simply push a button on the known entrance track and another button on the desired exit track. The logic circuitry handled all the necessary actions of commanding the underlying relay interlocking to set signals and throw switches in the proper sequence, as required to provide valid route through

4500-761: The route to be used is proven safe. Interlocking is a safety measure designed to prevent signals and points/switches from being changed in an improper sequence. For example, interlocking would prevent a signal from being changed to indicate a diverging route, unless the corresponding points/switches had been changed first. In North America, the official railroad definition of interlocking is: " An arrangement of signals and signal appliances so interconnected that their movements must succeed each other in proper sequence ". A minimal interlocking consists of signals , but usually includes additional appliances such as points and Facing Point locks (US: switches) and derails , and may include crossings at grade and movable bridges. Some of

4575-643: The signal industry was achieving the same level of safety and reliability that was inherent to purely mechanical systems. An experimental hydro-pneumatic interlocking was installed at the Bound Brook, New Jersey junction of the Philadelphia and Reading Railroad and the Lehigh Valley Railroad in 1884. By 1891, there were 18 hydro-pneumatic plants, on six railroads, operating a total of 482 levers. The installations worked, but there were serious defects in

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4650-780: The signaller without any hardware modifications. " Solid State Interlocking " (SSI) is the brand name in trade of work of the first generation microprocessor -based interlocking developed in the 1980s by British Rail , GEC-General Signal and Westinghouse Signals Ltd in the UK. Second generation processor-based interlockings are known by the term "Computer Based Interlocking" (CBI), of which VPI (trademark of General Railway Signal , now Alstom), MicroLok (trademark of Union Switch & Signal , now Hitachi Rail STS ), Westlock and Westrace (trademarks of Invensys Rail , now Siemens), and [Smartlock ] (trademark of Alstom ), and EBI Lock (trademark of Bombardier ) are examples. Interlockings allow trains to cross from one track to another using

4725-421: The singular). In any case, it provides the necessary details about the specific requirements. Standards for specifications may be provided by government agencies, standards organizations ( SAE , AWS , NIST , ASTM , ISO / IEC , CEN / CENELEC , DoD , etc.), trade associations , corporations , and others. A memorandum published by William J. Perry , U.S. Defense Secretary , on 29 June 1994 announced that

4800-505: The state or position of each signal appliance. As appliances are operated, their change of position opens some circuits that lock out other appliances that would conflict with the new position. Similarly, other circuits are closed when the appliances they control become safe to operate. Equipment used for railroad signalling tends to be expensive because of its specialized nature and fail-safe design. Interlockings operated solely by electrical circuitry may be operated locally or remotely, with

4875-423: The term specification is here used in connection with a data sheet (or spec sheet ), which may be confusing. A data sheet describes the technical characteristics of an item or product, often published by a manufacturer to help people choose or use the products. A data sheet is not a technical specification in the sense of informing how to produce. An " in-service " or " maintained as " specification , specifies

4950-419: The term is used differently in different technical contexts. They often refer to particular documents, and/or particular information within them. The word specification is broadly defined as "to state explicitly or in detail" or "to be specific". A requirement specification is a documented requirement , or set of documented requirements, to be satisfied by a given material, design, product, service, etc. It

5025-466: The umbrella of a quality management system . These types of documents define how a specific document should be written, which may include, but is not limited to, the systems of a document naming, version, layout, referencing, structuring, appearance, language, copyright, hierarchy or format, etc. Very often, this kind of specifications is complemented by a designated template. Electronic interlocking In railway signalling , an interlocking

5100-460: Was based on the time sequence of construction, working from exterior to interior, and this logic is still somewhat followed as new materials and systems make their way into the construction process. Each section is subdivided into three distinct parts: "general", "products" and "execution". The MasterFormat and SectionFormat systems can be successfully applied to residential, commercial, civil, and industrial construction. Although many architects find

5175-430: Was condensed into a single large power signal box with a control panel in the operator's area and the equivalent of a telephone exchange in the floors below that combined the vital relay based interlocking logic and non-vital control logic in one place. Such advanced schemes would also include train describer and train tracking technologies. Away from complex terminals unit lever control systems remained popular until

5250-435: Was extended to public supply contracts by the then European Communities' Directive 77/62/EEC coordinating procedures for the award of public supply contracts, adopted in 1976. Some organisations provide guidance on specification-writing for their staff and partners. In addition to identifying the specific attributes required of the goods or services being purchased, specifications in the public sector may also make reference to

5325-574: Was installed in Lincoln, Nebraska on the Chicago, Burlington and Quincy Railroad . Entrance-Exit Interlocking (NX) was the original brand name of the first generation relay-based centralized traffic control (CTC) interlocking system introduced in 1936 by GRS (represented in Europe by Metropolitan-Vickers ). The advent of all electric interlocking technology allowed for more automated route setting procedures as opposed to having an operator line each part of

5400-441: Was installed in 1843 at Bricklayers Arms Junction , England. Power interlockings may also use mechanical locking to ensure the proper sequencing of levers, but the levers are considerably smaller as they themselves do not directly control the field devices. If the lever is free to move based on the locking bed, contacts on the levers actuate the switches and signals which are operated electrically or electro- pneumatically . Before

5475-428: Was not implemented very widely. Union Switch & Signal bought their company in 1882. As technology advanced the railway signaling industry looked to incorporate these new technologies into interlockings to increase the speed of route setting, the number of appliances controlled from a single point and to expand the distance that those same appliances could be operated from the point of control. The challenge facing

5550-500: Was set up in 1952 at Lucknow, for undertaking the intensive investigation of railway problems, providing basic criteria and new concepts for design purposes, for testing prototypes and generally assisting in finding solutions for specific problems. In 1957, the Central Standards Office (CSO) and the Railway Testing and Research Centre (RTRC) were integrated into a single unit named Research Designs and Standards Organisation (RDSO) under

5625-408: Was the brand name of their Entrance-Exit system supplied by Union Switch & Signal Co. (US&S), and introduced in 1951. NX type systems and their costly pre-solid state control logic only tended to be installed in the busier or more complicated terminal areas where it could increase capacity and reduce staffing requirements. In a move that was popular in Europe, the signalling for an entire area

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