CTC, or Centralized Traffic Control, is a railway signal system in which signals convey authority to operate in a section. This allows dispatchers to direct train movements without train orders, timetables, or track warrants.

This is different from ABS (Automatic Block Signal) systems, where signals only provide a protective function, preventing trains from entering occupied blocks. Trains under ABS rules still require separate written authority to occupy the trackage.

Categories: Glossary