Automatic Cab Signal System

Automatic Cab Signal System (ACS)
A system which provides for the automatic operation of the cab signals and cab warning whistle.
Automatic Control
The control of the train automatically by some predetermined electrical or mechanical method.

Automatic Cab Signal System (ACS) (US) A system that automatically operates a display of signal aspects in the cab of a train as well as the cab warning whistle.

See also: Special, Track, Freight car, Train Brake, Train