Signals

Signals are mechanical and electrical devices erected beside a railway to pass information relating to the state of the line ahead of the engine.
Signalmen use these to direct an engine's crew to make certain movements or to stop. However, sometimes engines do not pay attention.
One time, Henry was pulling "The Flying Kipper" when he collided with a goods train because snow and ice forced the signal down, making it appear that the line was clear.
On Sodor, all signals point upward to indicate that an engine needs to stop and downward to indicate "go". Gordon and James once played a trick on Percy about "backing signals". So when Percy came to a signal and it went up instead of down to indicate that he could go, he thought it was a "backing signal", James also knocked down two signals, once with some wellwagons of tractors, and another with Rocky's crane arm causing confusion and delay.
Category:Railway Infrastructures