Explore: Block Signals

was clear. This was called the "absolute block system". Fixed mechanical signals began to replace hand signals from the 1830s. These were originally worked

situations, a system of signals is used to control the passage of trains between the blocks. When a train enters a block, signals at both ends change to

through. The absolute block system does not replace the use of any other form of signalling, such as fixed signals, hand signals, or detonators – and,

explicit "restricted proceed"-type signal. Other types of signals include train order signals, manual block signals or signals governing special safety appliances

currently uses automatic block signaling, with fixed wayside signals and automatic train stops. Many portions of the signaling system were installed between

series of signals that divide a railway line into a series of sections, called blocks. The system controls the movement of trains between the blocks using

non-automatic block system trains cannot leave a station without an appropriate token, even if the starting signal is clear. Home, starting and block signals on

A player may also "wiggle" or "flash" one block signal to indicate which opponent to serve to. Block signals may also be given during a rally while the

colour-light signals using track circuit – or axle counter – block signalling. It is a development of the original absolute block signalling that is still

Railway semaphore signals are an early form of fixed railway signals. The semaphore system involves signals that display their different indications to