Automatic block signaling
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Automatic block signaling, spelled automatic block signalling or called track circuit block in the UK, is a railroad communications system that consists of a series of signals that divide a railway li
Searchlight type automatic block signal at Milepost 122.2 on the Reading Blue Mountain and Northern Railroad Lehigh Line (former Lehigh Valley Railroad) in Jim Thorpe, Pennsylvania
A caution signal at ME 130 at Beaconsfield station in England, where the horizontal black bar at the top of the ID plate indicates an automatic signal
A pair of ABS position light signals each governing one direction of travel on Norfolk Southern Railway's Enola Branch (former Pennsylvania Railroad)
Train order operation
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Train order operation is a system for safely moving trains using train orders, as opposed to fixed signals or cab signalling. In train order operation, a "train order" is an order issued by or through
Picking up train orders on the ATSF in Isleta, New Mexico in 1943
