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Thursday, November 21, 2013

CSX Cumberland Bypass Bridge

CSX Cumberland Bypass Bridge

This tall and long railroad bridge crosses the Cumberland River to the east and upstream of downtown Nashville. The southern end of the bridge on the right is located next to the Omohundro water filtration plant (an area that is usually off limits to most people.) The northern end runs through Shelby Park as many segments of the trestle can be walked or driven under. It was completed in 1914 by L&N to provide a spur to bypass Union Station.

If you're into bridge specifics, here's an article published in the Engineering Record of August 30, 1913: "The Cumberland River Bridge of the Louisville & Nashville Railroad is approximately 3000 ft. long. including a viaduct approach at each end, one 300' and three 200' through-truss river spans and three 135' deck truss spans, all of which have riveted connections except the pin connected 300' span . The substructure is entirely of concrete, of which there about 1700 yd. which were built in cofferdams of interlocking steel sheet piling, under an average head of about 16' of water. All foundations were carried down to bed rock to a depth of 130' below base of rail. In three of the cofferdams considerable difficulty was experienced from encountering open conduits leading to the city waterwork pumping station, close to one end of the bridge. The concrete was mixed in a plant on each bank of the river and was carried by hauling engines to the different piers. All of the truss spans are erected on falsework built with an overhead traveling stiffleg derrick. It is expected that the erection will be completed this fall. The steel superstructure was fabricated by the American Bridge Co and erected by the Foster-Creighton-Gould Co, of Nashville, Tenn., which has also constructed the substructure."

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