Centralized traffic control
Videos
Centralized traffic control is a form of railway signalling that originated in North America. CTC consolidates train routing decisions that were previously carried out by local signal operators or the
Active Union Switch and Signal Co relay based CTC machine at THORN tower in Thorndale, Pennsylvania
CTC automatic block signals along the Union Pacific Railroad Yuma Subdivision, Coachella, California
Computer-based controls for a modern electronic interlocking
Automatic block signaling
Videos
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)