Yellow indicates approach, but at a restricted speed. Be prepared to stop at the next signal.
Red indicates stop, the block is currently occupied.
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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.
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.
A red aspect (Danger) tells the driver that they must stop at this signal and they must come to a complete stop by the signal. They must not proceed past this signal and if they do, automatic emergency braking is applied and will bring the train to a halt.
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.
The traffic light sequence is red, red and amber, green, amber and then red again. Prepare for your theory test with our traffic lights guide. Traffic lights are one of those things that most learner drivers are familiar with before they even start preparing for their theory test or practical driving test.
Signal lights have a red light that means stop, a green light that means go, and a yellow (amber) light, which when on by itself and not flashing means stop if able to do so safely.
The orange flag indicates that a train should be prepared to stop due to conditions it will be approaching. The yellow and red flag indicates that there is a temporary speed reduction followed by a stop signal. The yellow and green flag indicates that there is a temporary speed reduction, followed by an all clear.
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.
“Depending on the length of the train, as well as the length and number of tracks at a rail yard or customer facility, the train may have to move back and forth as it shoves cars into one track, backs out, and then moves forward to drop off or pick up cars on an adjacent track.”
Over-fatigued drivers and utility workers present a hazard. Waving means you're at least half awake and alert enough to notice a fellow laborer and therefore respond safely if something unexpected happens.