Misplaced Pages

#858141

20-715: MacArthur Bridge may refer to: MacArthur Bridge (St. Louis) , a bridge in St. Louis, Missouri, United States MacArthur Bridge (Detroit) , a bridge in Detroit, Michigan, United States MacArthur Bridge (Burlington) , a bridge in Burlington, Iowa, United States (replaced with the Great River Bridge ) MacArthur Bridge (Manila) , a bridge in Manila , Philippines Collection of two bridges across

40-405: A rotary car dumper is required to unload them. Some "dual-purpose" hoppers have a rotary coupler on one or both ends, so they can be used in both rotary and bottom-dump operations. Two main types of hopper car exist. Covered hopper cars, which are equipped with a fixed roof, are used for cargo like grain , sugar , and fertilizer , and Portland cement that must be protected from exposure to

60-507: A machine for grinding grain into flour . Historically, open hopper cars were used to carry coarse mined products like coal , ore , and gravel , while boxcars were used for granular materials requiring protection from the elements. Weatherproof covers were added to hopper cars, creating the covered hopper. Early production emphasized two-bay cars very similar to open coal hoppers and suitable for materials of similar density, like Portland cement or rock-salt . Some cars were available in

80-487: A whole train, or may be sent back in smaller quantities on manifest trains (trains which carry just about any type of freight). These trains are used primarily for hauling products such as corn , wheat and barley . The word "hopper", meaning a "container with a narrow opening at bottom", goes back to the thirteenth century, and is found in Chaucer 's story " The Reeve's Tale " (written late fourteenth century) in reference to

100-592: Is a type of railroad freight car that has opening doors on the underside or on the sides to discharge its cargo. They are used to transport loose solid bulk commodities such as coal , ore , grain , and track ballast . The hopper car was developed in parallel with the development of automated handling of such commodities, including automated loading and unloading facilities. Hopper cars are distinguished from gondola cars , which do not have opening doors on their underside or sides. Gondola cars are simpler and more compact because sloping ends are not required, but

120-461: Is different from Wikidata All article disambiguation pages All disambiguation pages MacArthur Bridge (St. Louis) Upon completion, the structure was the largest double-deck steel bridge in the world. Following a 1906 Congressional bill authorizing the City of St. Louis to build a new Mississippi River Bridge, bonds were issued for an initial amount of $ 3.5 million. Construction on

140-730: Is now in use only by railroads. The disused vehicle deck has been removed. In 1989, the Terminal Railroad Association of St. Louis acquired the MacArthur Bridge from the City of St. Louis in exchange for the title to the Eads Bridge . The Eads bridge, one of the primary reasons for the TRRA's original formation, had become obsolete for modern-day rail traffic due to the height restrictions it placed on rail cars. By 2007, only about 30% of

160-548: Is predominantly a term for shorter open hopper cars hauling taconite by the Duluth, Missabe and Iron Range Railway on Minnesota 's Iron Range . The Coke Express , a CSX unit train of hopper cars loaded with coke , with the words "Coke Express" painted on the sides of the hoppers. Large unit trains of various grain crops are a common sight in North America , reaching up to 125 cars long. These predominantly haul grain from

180-681: The Keelung River as part of the MacArthur Thruway in Taipei. Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title MacArthur Bridge . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=MacArthur_Bridge&oldid=760274682 " Category : Disambiguation pages Hidden categories: Short description

200-436: The 1910s, and became more common by the 1940s. These early cars were volume-limited for less dense commodities like grain or sugar , so later designs include longer covered hopper cars with higher sides and three or more bottom bays. Increasing axle load limits have allowed some of the heavier loads formerly assigned to two-bay hoppers to be assigned to larger, more efficient three-bay hoppers. Some covered hopper cars retain

220-414: The bridge began 1909, however, money ran out before the bridge approaches could be finished. This led to a second bond issuance of $ 2.75 million in 1914, and the bridge did not open until 1917, when it was first opened to automobile traffic. Railroad traffic would not use the bridge's lower deck until 1928. The bridge was built by Missouri Valley Bridge & Iron Co. and American Bridge Company , with

SECTION 10

#1732845362859

240-446: The conventional centersill as a strength member transmitting compression and tension forces from one car to the next. Beginning in the 1960s, designs distributing these forces along the sides of the car eliminated the centersill beam to simplify bulk material handling with wider hopper openings reducing the tendency for bridging to restrict gravity flow when unloading the car. Increase in wheel loads has important implications for

260-414: The design completed by Boller & Hodge. From 1929 through 1955, the MacArthur Bridge carried U.S. Highway 66 until the completion of the nearby Poplar Street Bridge . From 1947 to 1974, U.S. Highway 460 crossed the bridge, terminating on the west side of the bridge. In 1981 the bridge was closed to vehicles because of pavement deterioration and the eastern ramp approaches were torn out. The bridge

280-672: The large farming areas of the Great Plains to various markets, but a number of unit trains originate from other major farming areas, such as Illinois and Indiana as well as the Canadian provinces of Alberta , Saskatchewan and Manitoba . These trains may originate from a single grain elevator , or may be marshaled in a yard from various locals (short trains which serve nearby industries). The destinations tend to be large flour mills or ports (for export), or they may be split up and delivered to multiple locations. The empty cars may return as

300-399: The rail infrastructure needed to accommodate future grain hopper car shipments. The weight of the car is transmitted to the rails and the underlying track structure through these wheel loads. As wheel loads increase, track maintenance expenses increase and the ability of a given rail weight, ballast depth, and tie configuration to handle prolonged rail traffic decreases. Moreover, the ability of

320-539: The renovated bridge will be able to handle a 15 ft train width (4.6 m), an increase from about 13.5 ft (4.1 m), and will support a railcar weight capacity of 315,000 lb (143,000 kg), an increase from 286,000 lb (130,000 kg). The project will allow longer and wider railroad cars on the approaches, and the new girders will extend the life of the bridge to 2085. Hopper car#Typical American freight car weights and wheel loads A hopper car ( NAm ) or hopper wagon ( UIC )

340-428: The top of the covered hopper may be a single long opening along the centerline or a pattern of multiple round or square openings positioned to allow uniform weight distribution when loading the car. Some covered hoppers have two to four separate bays, with chutes at the bottom to direct unloading contents. Hopper cars have been used by railways worldwide whenever automated cargo handling has been desired. "Ore jennies"

360-489: The total deck reserved for automobile use had been removed. Most of the removed sections were on the East St. Louis side. The western ramp was relinquished to Ralston Purina and turned into a parking lot. In 2013 the TRRA began removing all of the auto deck over the river. By late 2014, the vehicle deck on the bridge proper had been removed, and work was progressing onto the western approach. The MacArthur Bridge continues to be

380-629: The vital railroad link connecting west to east for a large number of commodities, and bulk cargo. In 2012, it was the 17th busiest railroad bridge in the United States carrying roughly 40 trains per day. In 2022, the Terminal Railroad began a $ 57.3 million rehabilitation project on the bridge. The project will include replacing the 1912 main span girders and a reconstruction of the Broadway truss in downtown St. Louis. Scheduled for completion in 2026,

400-401: The weather. Open hopper cars, which do not have a roof, are used for commodities such as coal , which can suffer exposure with less detrimental effect. Removable canvas covers are sometimes used to protect moisture sensitive commodities in open hopper cars. Closed hopper cars have a metal top with waterproof loading hatches, which provides superior protection. These loading hatches along

#858141