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62-617: The Stalwart , formally classified by the British Army as Truck, High Mobility Load Carrier (HMLC), 5 Ton, 6 x 6, Alvis Stalwart and informally known by servicemen as the Stolly , and by former RCT as the Stally , is a highly mobile amphibious military truck . Built by Alvis Cars between 1960 and 1971, these vehicles served with the British Army from 1963 until 1993. Alvis had great success with

124-424: A certain amount of slip between the two sets of wheels on each side of the vehicle on hard surfaces, but there is no allowance for rotational speed differences between front and rear. The centre no-spin unit allows the wheels on either side of the vehicle with most grip to drive when off-road. This has the effect of making the vehicle appear to crab (move from side to side) when negotiating muddy conditions, thus making

186-544: A further three-year order in 2015, but then Axion filed for bankruptcy in December 2015, though it continues to trade. These ties are developed by Dr. Nosker at Rutgers University. Composite sleepers, manufactured from various recycled plastics, were introduced in Wiltshire , United Kingdom, in 2021. They were installed as an alternative to wooden sleepers, on a bridge where concrete sleepers would have been too heavy. Although it

248-489: A greater acoustic sharpness on straight stretches of track. Concrete ties were however shown to be quieter than wooden ties almost universal across the audible frequency band on curves. This causes train noise when over concrete ties to potentially be subjectively perceived as louder than train noise over wooden ties. On the highest categories of line in the UK (those with the highest speeds and tonnages), pre-stressed concrete ties are

310-401: A joint may be 12 inches (305 mm) wide where the formation is soft or the traffic is heavy and fast. Sleepers are mostly spaced 2 ft 7 in (0.79 m) apart (centre-to-centre) but are closer adjacent to fishplated rail joints where the spacing sequences are as follows with the spacing at the fishplate highlighted . The fractional inch spacing at the fishplate corresponds to

372-494: A longer service life and require less maintenance than timber due to their greater weight, which helps them remain in the correct position longer. Concrete ties need to be installed on a well-prepared subgrade with an adequate depth on free-draining ballast to perform well. It is a common misconception that concrete ties amplify wheel noise. A study done as part of Euronoise 2018 proved this false, showing concrete sleepers to be an average of 2dB(A) quieter than wooden ones, however with

434-494: A number of different specialist trades. These included: In conversation, the 'Driver' element was often omitted from these other Driver roles, even though the rank abbreviation of Dvr remained. Clerical trades also completed basic driver training before going on to specialise Again basic driver training was required. Railroad tie A railroad tie , crosstie ( American English ), railway tie ( Canadian English ) or railway sleeper ( Australian and British English )

496-514: A private venture of an off-road truck, capable of carrying 5 tons and being highly mobile. Using the hull and cab of the Salamander, Alvis created the 'Camion' for the military and civilian market. The military, having conducted fording trials with the Saracen, asked if Camion would float. Camion is commonly known by its chassis number of PV 1 (Project Vehicle 1), and as "The Beast" by staff at Alvis. While

558-507: A service life longer than wooden ties with an expected lifetime in the range of 30–80 years, that the ties are impervious to rot and insect attack, and that they can be modified with a special relief on the bottom to provide additional lateral stability. In some main track applications the hybrid plastic tie has a recessed design to be completely surrounded by ballast. Aside from the environmental benefits of using recycled material, plastic ties usually replace timber ties soaked in creosote,

620-562: A single monolithic concrete casting. This system is in use in Austria ; in the Austrian system the track is fastened at the four corners of the frame, and is also supported midway along the frame. Adjacent frame ties are butted close to each other. Advantages of this system over conventional cross increased support of track. In addition, construction methods used for this type of track are similar to those used for conventional track. In ladder track,

682-427: A tie rod are somewhat similar. Historically wooden rail ties were made by hewing with an axe, called axe ties , or sawn to achieve at least two flat sides. A variety of softwood and hardwood timbers are used as ties, oak , jarrah and karri being popular hardwoods, although increasingly difficult to obtain, especially from sustainable sources. Some lines use softwoods , including Douglas fir ; while they have

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744-483: Is 3,250 wooden crossties per mile (2,019 ties/km, or 40 ties per 65 feet) for wood ties or 2,640 ties per mile for concrete ties. The London, Midland and Scottish Railway specified 18 sleepers per 45-foot (13.72 m) rail and 24 sleepers per 60-foot (18.29 m) rail, both of which correspond to 2,112 sleepers per mile. Sleepers are 8 ft 6 in (2.59 m) long, 10 inches (254 mm) wide and 5 inches (127 mm) deep. The two sleepers adjacent to

806-670: Is a Morris multi-layer drum, driven by a P.T.O. mounted hydraulic pump. The winch pull is 5400;kg. The MK 2 was known as Amfibiebil 101C in Sweden, and again some were fitted with the FOCO 4000 ZXX cranes. Whilst the Stalwart could be used for troop movement, it was more regularly used for carrying Packed fuel (over 300 Jerry cans), ammunition, or the Gloster SARO UBRE Unit Bulk Refuelling Equipment pack as alternatives to

868-464: Is a pair of two pre-stressed concrete ties longitudinally connected by four steel rods. The design is said to be suitable for track with sharp curves, track subject to temperature stress such as that operated by trains with eddy brakes , and bridges, and as transition track between traditional track and slab track or bridges. Concrete monoblock ties have also been produced in a wider form (e.g. 57 cm or 22 + 1 ⁄ 2  in) such that there

930-460: Is a rectangular support for the rails in railroad tracks . Generally laid perpendicular to the rails, ties transfer loads to the track ballast and subgrade , hold the rails upright and keep them spaced to the correct gauge . Railroad ties are traditionally made of wood , but prestressed concrete is now also widely used, especially in Europe and Asia. Steel ties are common on secondary lines in

992-415: Is being employed by major US railroads in a dual treatment process in order to extend the life of wood ties in wet areas. Some timbers (such as sal , mora , jarrah or azobé ) are durable enough that they can be used untreated. Problems with wooden ties include rot, splitting, insect infestation, plate-cutting, also known as chair shuffle in the UK (abrasive damage to the tie caused by lateral motion of

1054-589: Is no ballast between the ties; this wide tie increases lateral resistance and reduces ballast pressure. The system has been used in Germany where wide ties have also been used in conjunction with the GETRAC A3 ballastless track systems. Bi-block (or twinblock) ties consist of two concrete rail supports joined by a steel bar. Advantages include increased lateral resistance and lower weight than monobloc concrete ties, as well as elimination of damage from torsional forces on

1116-518: Is often limited due to rot. Some entrepreneurs sell new ties. Due to the presence of wood preservatives such as coal tar , creosote or salts of heavy metals , railroad ties introduce an extra element of soil pollution into gardens and are avoided by many property owners. In the UK, new oak or pine beams of the same length (2.4m) as standard railway sleepers, but not treated with dangerous chemicals, are available specifically for garden construction. In some places, railroad ties have been used in

1178-578: The FV603 Saracen armoured personnel carrier, being produced from 1952. The Saracen had permanent 6 wheel drive, and independent parallel wishbone links and torsion bar suspension on each wheel station. Alvis then used the same suspension and drive methods to develop the FV601 Saladin armoured car, and the Salamander airfield crash tender. Following the success of those vehicles, Alvis then decided to start

1240-565: The Hejaz railway in the Arabian Peninsula where the dry, hot climate made wood ties unsatisfactory. Modern steel ties handle heavy loads, have a proven record of performance in signalized track, and handle adverse track conditions. Of high importance to railroad companies is the fact that steel ties are more economical to install in new construction than creosote-treated wood ties and concrete ties. Steel ties are utilized in nearly all sectors of

1302-880: The Options for Change review, the Royal Logistic Corps (RLC) was formed by the amalgamation of The Royal Corps of Transport, the Royal Army Ordnance Corps, the Royal Pioneer Corps , the Army Catering Corps , and the Postal and Courier elements of the Royal Engineers . Regiments of the Royal Corps of Transport, including where known last name up to disbandment: The Royal Corps of Transport consisted of

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1364-429: The chairs holding the rails fixed to those blocks. One advantage of this method of construction was that it allowed horses to tread the middle path without the risk of tripping. In railway use with ever heavier locomotives, it was found that it was hard to maintain the correct gauge . The stone blocks were in any case unsuitable on soft ground, such as at Chat Moss , where timber ties had to be used. Bi-block ties with

1426-498: The British Army purchased 932, with 24 sold to other countries. Stalwart Mk 2 limber. An artillery ammunition supply vehicle for the Abbot self-propelled gun . There was an extra seat in the cab for the crane operator plus four rear-mounted seats for a seven-man crew. An Atlas 3001/66 hydraulic crane capable of lifting three tons was added to the cargo area to lift palletised loads of ammunition. The rear crew folding seats were separated from

1488-613: The Mk 2 Stalwart. Two extra rear-mounted seats were added to the main cargo area for a four-man crew. An Atlas 3001 hydraulic crane capable of lifting three tons was added to the cargo area. This differed from that of the FV623 variant by having hydraulic anti-creep check valves fitted. This modified crane was more stable (and safer) for lifting and holding engine, transmission, and other heavy equipment whilst manoeuvring them into position. When swimming on deep water when fording operations are expected, i.e.

1550-466: The Stalwart a true six-wheel-drive vehicle, with three wheels locked together and turning at the same speed. However, this system causes " wind up " in the transmission (inter-component stress) as all the wheels are forced to rotate at the same speed, which during cornering is impossible. This led to rapid wear and breakage of the tracta joints within the drive train if the vehicle was used on firm surfaces, such as tarmac or concrete; in off-road conditions,

1612-570: The UK; plastic composite ties are also employed, although far less than wood or concrete. As of January 2008, the approximate market share in North America for traditional and wood ties was 91.5%, the remainder being concrete, steel, azobé (red ironwood) and plastic composite. Tie spacing may depend on the type of tie, traffic loads and other requirements, for example 2,640 concrete ties per mile on North American mainline railroads to 2,112 timber ties per mile on LMS jointed track. Rails in

1674-448: The US may be fastened to the tie by a railroad spike ; iron/steel baseplates screwed to the tie and secured to the rail by a proprietary fastening system such as a Vossloh or Pandrol which are commonly used in Europe. The type of railroad tie used on the predecessors of the first true railway ( Liverpool and Manchester Railway ) consisted of a pair of stone blocks laid into the ground, with

1736-490: The advantage of accepting treatment more readily, they are more susceptible to wear but are cheaper, lighter (and therefore easier to handle) and more readily available. Softwood is treated, with creosote being the most common preservative for railway ties. Other preservatives used include pentachlorophenol and chromated copper arsenate . Sometimes non-toxic preservatives are used, such as copper azole or micronized copper . New boron -based wood preserving technology

1798-455: The all-wheel drive, multiple gearboxes, and the water propulsion units, is complex and needed a lot of maintenance. When the amphibious qualities became unnecessary, it was common for the water jets to be removed to reduce weight and maintenance. The Stalwart's over-terrain capabilities come from the fact that the six-wheel-drive system lacks differentials , using simple bevel gears to transmit drive. A centre-mounted no-spin differential allows

1860-512: The ballast. This is due to better damping properties of hybrid plastic ties and composite ties, which will decrease the intensity of vibrations as well as the sound production. In 2009, Network Rail announced that it would begin replacing wooden ties with recycled plastic. but I-Plas became insolvent in October 2012. In 2012, New Zealand ordered a trial batch of "EcoTrax" brand recycled composite ties from Axion for use on turnouts and bridges, and

1922-520: The cab or either side on some models. The cab can only be entered through roof hatches. The dropping side windows are emergency escape hatches. The Stalwart can carry 5 tonnes of stores. Early press releases in Commercial Motor suggests it could tow 10 tonnes. But trial reports by MEXE showed it could easily handle 7.5 ton. In the water it can be driven at about 6 knots by vectored thrust water-jet propulsion units. The drive system, which includes

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1984-522: The cab. This is chassis number STAL 11 / 706, and currently resides at Jesada Technik Museum in Bangkok. MOD Merlin records suggest that 706 was made in the first part of 1969. Listed by Alvis sales figures Of the Swedish Amfibiebil 101C sold in 1985; https://sites.google.com/view/alvis-stalwart-hmlc-files/hmlc-stalwart-files Royal Corps of Transport The corps was formed in 1965 from

2046-524: The construction of homes, particularly among those with lower incomes, especially near railroad tracks, including railroad employees. They are also used as cribbing for docks and boathouses . The Spanish artist Agustín Ibarrola has used recycled ties from Renfe in several projects. In Germany, use of wooden railroad ties as building material (namely in gardens, houses and in all places where regular contact to human skin would be likely, in all areas frequented by children and in all areas associated with

2108-716: The existing ballast, unlike concrete ties which require a full depth of new ballast. Steel ties are 100% recyclable and require up to 60% less ballast than concrete ties and up to 45% less than wood ties. Historically, steel ties have suffered from poor design and increased traffic loads over their normally long service life. These aged and often obsolete designs limited load and speed capacity but can still be found in many locations globally and performing adequately despite decades of service. There are great numbers of steel ties with over 50 years of service and in some cases they can and have been rehabilitated and continue to perform well. Steel ties were also used in specialty situations, such as

2170-448: The first MK 2s available for second-hand purchase. They were based at RAF Gan as Reef Rescue and manned by the RAF fire fighters. Bangkok International Airport bought a 623 Limber version as a rescue vehicle, in case any aircraft should end up in the water surrounding the airport. The main difference between this and every other Stalwart is the factory-fitted water monitor, mounted on the roof of

2232-476: The five tonnes of cargo. The jet drive units in all the Mk 2 variants were much more efficient, giving a claimed 9 knots. The most obvious visible difference between Mk 1 and Mk 2 variants is that the lower edges of the cab windows were now angled downwards rather than horizontal. This was to improve visibility at close range, particularly when being marshalled by a banksman standing nearby. A total of 956 Mk 2 FV622, FV623 and FV624 Stalwarts were produced, of which

2294-415: The hull forms a punt chassis . The engine is situated under the load deck in the rear of the hull and the gearbox with transfer box and differential forward of this. The load deck is open-topped with large drop-down panels on either side and rear. Waterproof seals ensure that these will not leak when in the water. The cab has the driver's position in the centre, and a seat for a passenger on the left side of

2356-709: The latter being a toxic chemical, and are theoretically recyclable. However, plastics may shed microplastics and leach other possibly toxic chemicals such as ultraviolet inhibitors. Hybrid plastic railroad ties and composite ties are used in other rail applications such as underground mining operations, industrial zones, humid environments and densely populated areas. Hybrid railroad ties are also used to be partly exchanged with rotten wooden ties, which will result in continuous track stiffness. Hybrid plastic ties and composite ties also offer benefits on bridges and viaducts, because they lead to better distribution of forces and reduction of vibrations into respectively bridge girders or

2418-405: The left side of the cargo bay. All MK2 had the chassis number STAL 11/, and ran from STALL 11/1 to STAL 11/956. Stalwart Mk 2 load carrier. This had a driver's and passenger's seat, although a third seat could be fitted to the right of the driver as a field modification. All Mk 2 have an internal hydraulic winch, which only operates through the front and is mounted below the driver. The winch type

2480-429: The main cargo area by a wooden divider, and protected from inclement weather by two folding PVC hoods on metal hoops. When swimming on deep water when fording operations are expected, i.e. the vehicle will be subjected to full floatation, it is important that the maximum load be restricted to 3 tons 10 cwt. (3556 kg). A total of 269 Mk 2 Stalwart limbers were produced. Stalwart Mk 2 REME fitters' vehicle, based on

2542-424: The military carried out fording trials at Instow , Alvis went away and developed PV 2. PV 2 was put through a number of trials and tests both in the UK and Sweden, and received various facelifts to the cab roof and body sides along the way. The final version of PV 2 has twin hatches and a Hiab crane, compared to the original having full-length sideboards and a sliding roof hatch. PV 2 was named Stalwart. The Stalwart

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2604-419: The natural 'slip' of a loose surface, such as mud or gravel, reduced wind up. This problem is of special concern for modern-day Stalwart owners – to get a vehicle to a show requires moving it by low-loader or driving it on the road, risking damage to the transmission. Alternatively, the front and rear driveshafts can be removed, eliminating wind-up at the expense of off-road capability. During military use,

2666-401: The only ones permitted by Network Rail standards. Most European railways also now use concrete bearers in switches and crossing layouts due to the longer life and lower cost of concrete bearers compared to timber, which is increasingly difficult and expensive to source in sufficient quantities and quality. Steel ties are formed from pressed steel and are trough-shaped in section. The ends of

2728-412: The original configuration, with the full-length single-skin side boards. Note the troops' uniforms. - YouTube - Alvis Stalwart 1962 PV 2 is seen with crane fitted in a film about the merger of Rover group and Alvis Youtube - combat Land Rover line up All MK 1 had the chassis prefix STAL, and ran from STAL 16 to STALL 140. Stalwart Mk 1 load carrier. This had a driver's and passenger's seat. The Mk 1

2790-401: The problem of transmission wind-up was solved by laying out railway sleepers (railroad ties) in a grid on flat ground and driving over them on long road moves; this allowed the transmission to unwind. On more than one occasion, servicemen drove Stalwarts into car parks and used the kerbstones separating parking bays for the same purpose. Another problem with the transmission was that the vehicle

2852-501: The resistance to track movement is very good. For curves the three-point contact of a Y steel tie means that an exact geometric fit cannot be observed with a fixed attachment point. The cross section of the ties is an I-beam . As of 2006, less than 1,000 km (621 mi) of Y-tie track had been built, of which approximately 90 percent is in Germany . The ZSX Twin tie is manufactured by Leonhard Moll Betonwerke GmbH & Co KG and

2914-430: The thermal expansion gap allowed between the rail ends. Interurban railways of the late 1800s and early 1900s generally ran lighter rolling stock than mainline steam railways, but roadbeds were built to similar standards. Wooden ties were placed at approximately 2-foot (0.61 m) intervals. Various methods exist for fixing the rail to the railroad ties. Historically spikes gave way to cast iron chairs fixed to

2976-507: The tie are shaped to form a "spade" which increases the lateral resistance of the tie. Housings to accommodate the fastening system are welded to the upper surface of the tie. Steel ties are now in widespread use on secondary or lower-speed lines in the UK where they have been found to be economical to install due their ability to be installed on the existing ballast bed. Steel ties are lighter in weight than concrete and able to stack in compact bundles unlike timber. Steel ties can be installed onto

3038-478: The tie plate) and spike-pull (where the spike is gradually loosened from the tie). Wooden ties can catch fire; as they age they develop cracks that allow sparks to lodge and more easily start fires. Concrete ties are cheaper and easier to obtain than timber and better able to carry higher axle-weights and sustain higher speeds. Their greater weight ensures improved retention of track geometry , especially when installed with continuous-welded rail. Concrete ties have

3100-440: The tie, more recently springs (such as Pandrol clips ) are used to fix the rail to the tie chair. In recent years, wooden railroad ties have also become popular for gardening and landscaping , both in creating retaining walls and raised-bed gardens, and sometimes for building steps as well. Traditionally, the ties sold for this purpose are decommissioned ties taken from rail lines when replaced with new ties, and their lifespan

3162-411: The ties are laid parallel to the rails and are several meters long. The structure is similar to Brunel's baulk track; these longitudinal ties can be used with ballast, or with elastomer supports on a solid non-ballasted support. The crosstie spacing of mainline railroad is approximately 19 to 19.5 inches (48 to 50 cm) for wood ties or 24 inches (61 cm) for concrete ties. The number of ties

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3224-457: The ties center due to the more flexible steel connections. This tie type is in common use in France, and are used on the high-speed TGV lines. Bi-block ties are also used in ballastless track systems. They are gauge-convertible by cutting and welding the steel bar to the dimension that suits the new gauge. Frame ties ( German : Rahmenschwelle ) comprise both lateral and longitudinal members in

3286-454: The ties, steel ties may be used with track circuit based train detection and track integrity systems. Without insulation, steel ties may only be used on lines without block signaling and level crossings or on lines that use other forms of train detection such as axle counters . In more recent times, a number of companies are selling composite railroad ties manufactured from recycled plastic resins and recycled rubber. Manufacturers claim

3348-551: The transport (land, water and air) elements of the Royal Army Service Corps (RASC) and the movement control and transportation elements of the Royal Engineers (RE). The Royal Army Service Corps’ functions of supply and transport were separated. The RCT became responsible for transport including ships and launches. whilst supplies became the responsibility of the Royal Army Ordnance Corps . In 1993, following

3410-424: The vehicle will be subjected to full floatation, it is important that the maximum load be restricted to 3 tons 10 cwt. (3556 kg). A total of 60 Mk 2 Stalwart fitters' vehicles were produced. 07ER57 (Chassis STAL 11/002, known to have been to Thailand for trials on Operation Mudlark in 1966) became 09AH16. 07ER63 became 00AG79. Both served with RAF from January 1967 to March 1976, when they were disposed of, being

3472-419: The worldwide railroad systems including heavy-haul, class 1s, regional, shortlines, mining, electrified passenger lines (OHLE) and all manner of industries. Notably, steel ties (bearers) have proven themselves over the last few decades to be advantageous in turnouts (switches/points) and provide the solution to the ever-growing problem of long timber ties for such use. When insulated to prevent conduction through

3534-480: Was a one off project vehicle that inspired the Stalwart; it was chassis number PV1. It consisted of an Alvis Salamander hull and cab, with the radiator still located in front of the rear mounted engine. PV 2, or Project Vehicle 2 took note of the MOD fording trials at Instow - and noted the roof hatch being used to access the cab. The first version of PV 2 had a sliding hatch, and full-length single-skin sideboards. The exhaust

3596-545: Was adopted and entered service with the British Army in 1964 as a general transport truck in preference to the FV431, the load carrier variant of the FV430 series . The high mobility and amphibious capabilities were considered ideal for resupplying units in the field, particularly those of the British Army of the Rhine . The Stalwart is a frameless vehicle with an all welded waterproof hull -

3658-523: Was also at the back of the cab. Numerous obvious modifications were made to PV 2, with the last one being the installation of a Hiab crane. A very early version of PV2 is filmed by Pathe News in Devon. Note the exhaust pipe is still at the back of the cab, and the fuel cap is low on the left side of the cab – below the waterline. YouTube - PV2 showing it paces in Devon during 1961 A Pathé News film from 1962 of PV2 in

3720-418: Was designed to be driven loaded. Driving the vehicle unloaded caused increased wear on the drivelines to the wheels as a result of the increased angle of mesh of the joints. See User manual and Crew reference card. All Prototypes for Stalwart were known as Private Venture (PV), and had the chassis number prefix PV. There were 15 PVs, with their destinations shown on Alvis letter of sales numbers. The Camion

3782-522: Was the first instance of plastic sleepers being installed on mainline track in the country, they have previously been used on narrow-gauge railways . Ties may also be made from fiberglass . An unusual form of tie is the Y-shaped tie, first developed in 1983. Compared to conventional ties, the volume of ballast required is reduced due to the load-spreading characteristics of the Y-tie. Noise levels are high but

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3844-502: Was used for troop movement in Aden, but the Stalwart was more regularly used for carrying packed fuel, over 300 Jerry cans, or ammunition as alternatives to the five tonnes of cargo in the UK and Germany. The majority of the Mk 1 models did not have winches fitted. Sweden mounted hydraulic winches onto the front of their MK 1 Stalwarts, known as Amfibiebil 101B. Sweden also mounted FOCO 4000 ZXX cranes on some of their vehicles, which are mounted to

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