Blue Signal DisplayBlue 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).
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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.
The Blue Train: Africa's Orient Express cancelled after derailments and arson. One of the world's most luxurious travel experiences and the jewel of South Africa's tourism industry has been taken out of service after a string of calamities including derailments and an arson attack.
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.