What are the railroad signal rules?
What are the railroad signal rules? Reading Color Light Signals Green indicates clear, the train can proceed. Yellow indicates approach, but at a restricted speed. Be prepared to stop at the next signal. Red indicates stop, the block is currently occupied.
What is the railway signaling in the UK?
The railway signalling system used across the majority of the United Kingdom rail network uses lineside signals to control the movement and speed of trains. The modern-day system mostly uses two, three, and four aspect colour-light signals using track circuit – or axle counter – block signalling.
What does a white shunt signal mean?
Shunt signals This type of signal is found in all depots and sidings. It is mounted to the ground unlike regular signals. It has three lights in a triangular shape and two white lights mean proceed at caution whereas any other indication should be taken as a stop signal or a malfunction.
Who controls train signals?
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).
How do train signals know when a train is coming?
A low-voltage electric current is sent between the two rails via a series of relays like the ones in this photo. When a train approaches, the current runs through the train's metal wheels and axles instead of the relays. This short circuit activates the crossing signal.
How are train signals activated?
A low-voltage electric current is sent between the two rails via a series of relays like the ones in this photo. When a train approaches, the current runs through the train's metal wheels and axles instead of the relays. This short circuit activates the crossing signal.
How do you signal a train to stop?
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.
How do trains not hit each other?
Trains cannot collide with each other if they are not permitted to occupy the same section of track at the same time, so railway lines are divided into sections known as blocks. In normal circumstances, only one train is permitted in each block at a time. This principle forms the basis of most railway safety systems.
What are the two basic railroad signals?
Railroad signals are categorized into two levels: Permissive and Absolute. Both serve a specific function of either protection or control.