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A low signal head governing slow movements.
Also known as: Railway ground signal, Low signal head
A North American signal mounted near the ground, governing movements within yards and interlockings at low speed.
Governs movements within yards and interlockings at low speed on North American railroads.
Contexts: Public information
Is mounted low for the same reason the British shunt disc is: sighting distance is short where speed is low, so height buys nothing.
Contexts: Public information
A short signal head mounted close to the ground rather than on a mast, otherwise carrying the same lamps as a full-height head.