What do train signal colors mean?
What do train signal colors mean? Railway signalling principles The signal lights usually have four indicators: Green: clear to go. Double yellow: still clear to go, but indicates that the following signal may be a warning. Yellow: warns that the next signal may be red. Red: means stop or danger ahead.
Why are British trains yellow?
People need to be able to see and hear trains appropriately so they're able to stay safe. In Britain, historically train fronts were required to have a yellow panel in order to make them more visible, a move which came in the 1950s when newer diesel and electric trains were found to be far quieter than steam.
What does a blue train signal mean?
Blue Signal Display Blue signals displayed in accordance with §§218.25, 27, or 29, signify that workers are on, under, or between railroad rolling equipment. When so displayed: The equipment may not be coupled to. The equipment may not be moved (see exceptions in §218.29).
What is the yellow signal for?
A STEADY YELLOW LIGHT tells you a steady red light will soon appear. If you are driving toward an intersection and a yellow light appears, slow down and prepare to stop. If you are within the intersection or cannot stop safely before entering the intersection, continue through carefully.
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.
What does an orange train signal mean?
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.