All red means stop. That's universal. For other aspects, the general principle is that green on top means main route or normal speed, and red over green or yellow indicates diverging route or medium speed. Interlocking signals are normally set at stop.
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At most crossings, the signals will activate about 30 seconds before the train arrives but there are sensors measuring speed so that the crossing knows when to activate; so, the slower the train is, the longer the delay and the faster the train is, the earlier the crossing activates.
Up until the 1980s, this system was also controlled by human operators. However, when computers started to become more commonplace, more automation was introduced. Nowadays, much of the rail signals are automated, and run thanks to a system called CBTC (Communications Based Train Control).
Wave a red flag at the train to signal for it to stop.If there's a threat to the train, such as an obstruction or person on the tracks ahead of it, wave a red flag vigorously at it to signal to the operator that they need to apply the emergency brakes.
Absolute signals are sometimes also known as “interlocking plant signals,” or more commonly today, “control points.” They received the name because these signals are typically operated in a control center by members of the Centralized Train Control (CTC).
Parts of the overhead wires (or the third rail) are left un-electrified in order to break the network up into manageable sectors (and to avoid some complicated electrical problems which I admit don't quite understand). When the train passes by one of these, it loses power, and the lights and ventilation go off.
Well before the train gets anywhere near the station it has lights that tell it to slow down, and stop. Depending on which lights are lit, depends on the drivers actions. Red and green are the same as normal road lights… stop or prepare to stop, and go or keep going.
Defective or damaged track circuits and axle counters are leading causes of signal failures. Damage to these components can be caused by moisture penetration, cuts, exposure to high temperatures, or rusting. In some cases, the damage may be caused by cable thieves who have pilfered cables for their copper content.
Driverless trains have been in operation on the Docklands Light Railway since it opened in 1987, though a train attendant is present to operate the doors and drive the train if needed.
Federal law requires the train crew when approaching a road crossing to sound the horn at all public crossings for the protection and safety of motorists and pedestrians regardless of whether crossings with gates and lights are present.
The position of the train driver differs from that of the conductor in that the former is in charge of running the locomotive while the latter manages the cars, including the crew, passengers and their activities.
Pulling the alarm chain on a British train will pull a lever connected to the brake pipe flaps. Pulling the alarm activates a piston, causing the flaps to be opened and all the air pushed out the air tube, forcing the brakes on.
Depending on the circumstance, if the engineer or conductor claim some extenuating condition, (the red dropped right in front of them) then an investigation would be held, but most of the time the crew admits they ran it, the CTC board will show when and where they got past it, the dispatcher will know, and most likely ...