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There are two main types of signaling aspect systems found in North America, speed signaling and weak route signaling. [citation needed] Speed signaling transmits information regarding how fast the train is permitted to be going in the upcoming segment of track; weak route signaling transmits information related to the route a train will be taking through a junction, and it is incumbent upon ...
Track lighting is a method of lighting where light fixtures are attached anywhere on a continuous track device which contains electrical conductors. [ 1 ] [ 2 ] This is in contrast to directly routing electrical wiring to individual light positions.
The structure gauge S requires buildings to be placed at minimum of 3,100 mm (10 ft 2 + 1 ⁄ 16 in) from the track centreline. Bridges and tunnels must have a clearance of at least 4,900 mm (16 ft 15 ⁄ 16 in) wide and 6,400 mm (20 ft 11 + 15 ⁄ 16 in) high.
Gauntlet tracks can be used to provide horizontal clearance to a fixed obstruction adjacent to a track such as a cutting, bridge, or tunnel.Frog gauntlets are also commonly used when a rail line's capacity is increased by the provision of an additional track, but cost or other factors prevent the widening of the bridges.
The track is free. [9] Movement allowed Track not clear: Shunting allowed Points and derailers are in the right position. The track is not free, or caution is needed. [9] Movement allowed Check points and clearance: Shunting allowed The driver must manually check the position of points and derailers, and the track clearance.
The code also defines the clearance that is shorter than the physical clearance to account for sag curves, bridge deflection and expected settlements with a recommendation of minimum clearance of 5 metres (16 ft 5 in). [2] In UK, the "standard minimum clearance" for structures over public highways is 16 feet 6 inches (5.03 m). [3]
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