In our world, a catenary is a system of overhead wires used to supply electricity to a locomotive, streetcar, or light rail vehicle which is equipped with a pantograph.
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An overhead line consists of one or more wires (or rails, particularly in tunnels) situated over rail tracks, raised to a high electrical potential by connection to feeder stations at regular intervals. The feeder stations are usually fed from a high-voltage electrical grid.
The horn alerts people that a train is approaching a railroad crossing. It can also be used to warn animals or trespassers in our right-of-way along a section of track. Many people don't realize that federal and state regulations require us to sound the horn whenever we approach any crossing.
If the engine is turned off for long periods of time, it takes another long span of time to repressurise the brake lines. Trains, being large and heavy, need the optimal brake line pressure for its efficient stopping.
Train operators and conductors play distinct and important roles: Operators drive the train, while conductors make announcements, stick their heads out of the cab to give the operator the all clear, open and close the train doors, and interact with passengers directly.
Conductors and engineers sleep at home or at a hotel at their away terminal. The operating crew of a train in the US can only be on duty for 12 hours and then must be relieved.