Signal Box
Tower or building housing equipment for operation of points and signals in a particular section of a route.
Signal Dolly ...
Signal box
A trackside building, usually with large windows, which housed a complex mechanical signal frame. The signalman would pull levers installed on this frame to operate semaphore signals. In North America these were called interlocking towers.
A signal box or signal cabin is a building from which railway signals and points are controlled. The term signal cabin is used in Ireland, parts of Scotland and in Australia.
Signal box: A building or room which houses signal levers (usually in a frame), a control panel or a VDU-based control system.
Signal Passed At Danger or SPAD (UK): where a train disobeys a stop signal.
Signal Box A building from which the surrounding turnouts and signals are operated. May contain either a lever frame or in more modern signal boxes a panel containing switches and coloured lights.
Signal Box
RAILWAYS. What the British call a signal box is, I think, called a tower in the USA.
Signal Passed At Danger (SPAD)
RAILWAYS. A British term for a train passing a red signal, almost always due to driver error.
Traditionally housed in a signal box, more recently a control room, where the signalling levers or controls are located. Politically correct grade now identified as "Signaller" by Railtrack.
The sequence of bells (block bells) used to communicate between signal boxes using a standardised code.
Bell Crank
A pair of cranks, free to rotate on the same spindle, with the crank arms secured approximately at right angles to each other.
Bell Code
The sequence of bells (block bells) used to communicate between signal boxes using a standard code.
There are also signal boxes with all the electronics removed from them still in position. We are required to stop and flag these crossings before proceeding over them.
 See also: Signal, Track, Engine, Board, Locomotive
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