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The earliest rail chairs, made of cast iron and introduced around 1800, were used to fix and support cast-iron rails at their ends; [2] they were also used to join adjacent rails. [ 35 ] In the 1830s rolled T-shaped (or single-flanged T parallel rail ) and I-shaped (or double-flanged T parallel or bullhead ) rails were introduced; both required ...
Hooks are installed at the end of the rail. Usually these hooks are part of a plate that is attached to the rail. The hooks then are inserted into the bed post mortise and hook over the pins. Plate-and-hook fastener. Instead of pins inserted horizontally into the bedpost, an eye plate (post plate) is installed on the bedpost.
A railroad tie, crosstie (American English), railway tie (Canadian English) or railway sleeper (Australian and British English) 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.
Once the hook passes the coupling pin, the spring force returns the coupling pin to its original position, holding the hook head in the coupling. When coupled, the coupler heads are free to move vertically, which should prevent a derailed car from dragging other cars with it in the event of a derailment on the elevated railway.
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The diagram from Beard's 1897 coupler patent [1]. Janney couplers were first patented in 1873 by Eli H. Janney (U.S. patent 138,405). [2] [3] Andrew Jackson Beard was amongst various inventors that made a multitude of improvements to the knuckle coupler; [1] Beard's patents were U.S. patent 594,059 granted 23 November 1897, which then sold for approximately $50,000, and U.S. patent 624,901 ...