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The tower and tracks at Deval interlocking, Des Plaines, Illinois, in 1993 In railway signalling, an interlocking is an arrangement of signal apparatus that prevents conflicting movements through an arrangement of tracks such as junctions or crossings.
CTC-controlled track is significantly more expensive to build than non-signalled track, due to the electronics and failsafes required. CTC is generally implemented in high-traffic areas where the reduced operating cost from increased traffic density and time savings outweigh the capital cost.
The signal box provided a dry, climate-controlled space for the complex interlocking mechanics and also the signalman. The raised design of most signal boxes (which gave rise to the term "tower" in North America) also provided the signalman with a good view of the railway under his control.
The Chicago and Western Indiana Railroad operated an extensive number of interlocking tower system on its system. From the north, towers were as follows: 12th Street tower, 15th Street tower, 16th Street tower, 21st Street tower, 40th Street tower, 47th Street tower, Ford Street tower (59th Street), 74th Street tower, 81st Street tower, Oakdale (later remote controlled by 81st Street), Pullman ...
Interlocking signals are controlled by human operators in a signal tower near the switches, not by the trains themselves. A train operator must use a punch box , which is located besides the cab window in the station closest to the interlocking, to notify the switch operator of which track the train needs to go to.
The interlocking apparatus is in the box behind the levers. A three-lever ground frame at Kyle of Lochalsh, released by Annett's key. The lever frame is located in the signal box, which can be a building at ground level or a tower, separated from or connected to an existing station building.
Alton Junction was controlled by a manned interlocking tower until 2005 when Amtrak transferred control to its new Chicago Terminal control center. Known as 21st Street tower, its operators handled movements through the busy plant using a US&S Model 14 electro-pneumatic interlocking machine. In its final years 21st St took remote control of the ...
Erie Railway and Pennsylvania Railroad, Horseheads Interlocking Tower Tower Horseheads: Chemung: New York NY-33: Erie Railway, Hornell Station 1971 Shop Hornell: Steuben: New York NY-34: Erie Railway, Hornell Erecting Shop 1971 Shop Hornell: Steuben: New York NY-35: Erie Railway, Corning Side Hill Cut 1971 Cut Corning: Steuben: New York NY-36