Train stops, also known as trips, tripcocks and tripstops, are devices fitted to most signals. They help to reduce the consequences of SPADs (signal passed at danger) by stopping the train at a red signal.
How it works Edit
Train stops are connected to a signal. When that signal shows a red signal, the trip arm will come up. If a train tries to go past the signal, the arm will strike the trip cock on the train, which then will apply the emergency brakes on the train. Because the emergency brake is applied, the train stops and can't move for a short time, because the brake pipe has to refill. This will increase the chance that the driver will noticed that s/he has done a SPAD.
Special Train Stops Edit
Low speed train stop
This is a type of train stop attached to a signal that can display a low speed indication. The trip arm still works normally while the signal is at stop. However, when the signal is changed to low speed, the arm will stay up. As the train approaches the signal, sensors will measure the speed of the train, by counting how long it takes for the train to pass a certain section. If the speed is under 25km/h, the trip arm will drop and the train will be able to pass. However, if the train is over 25km/h, the train will strike the trip and be brought to a halt.
These trips are only found in major stations that have trains very close to each other. They are found along the length of a platform, seemingly not connected to any signal. However, they are connected to the signal at the end of the platform. When the signal at the end of the platform is at stop, all the trips will come up and act like a low speed trip. They will force the train to slow down for the red signal. The last trip, closest to the signal, requires a speed of about 4km/h.
Fixed train stops
These are train stops that are stuck in the up position, to protect dead ends.
Reverse Direction Edit
When the train is going backwards through the train stop for any reason (e.g. bidirectional signalling), the train stop will come down even if it is at stop. This is because the tripcock at the back of the train can be struck.