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A colour light head of three or four aspects.
Also known as: Indian colour light signal, Multiple aspect colour light signal
The standard Indian Railways running signal, showing red, yellow, double yellow or green.
Shows the running aspect governing a train movement on Indian Railways.
Contexts: Public information
Uses four aspects on busy routes and three elsewhere, so the number of lamps on a head indicates how closely trains are worked on that line.
Contexts: Public information
A vertical head of lamps of which one shows at a time, except in the double warning aspect where two show together.