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Grand Scales General Code of Operating Rules First Edition January 1, 2007

Railroad Definitions

For the purpose of these rules the following definitions apply:


Automatic Block Signals.


A combination of devices, operated by compressed air, arranged in a system and controlled manually or pneumatically, which retard or arrest the motion of a car or locomotive.

Airbrake Hose

Reinforced flexible tubing attached to a nipple that screws into the angle cock at the end of the brake pipe on each end of the car or engine. The other end is fitted with a coupling (glad hand), which engages with an identical coupling on the adjoining car. The complete arrangement forms a flexible air connection between the brake pipes of the cars and engines throughout the train.

Air Compressor A device on a locomotive that compresses air, used for train brakes and other accessories on the locomotive.

Air Gauge An instrument for indicating air pressure, usually expressed in pounds per square inch.

Angle Cock A manually operated valve at each end of the brake pipe on locomotives and cars to permit or prevent the flow of air.

Aspect The information displayed by a fixed signal. An aspect conveys an indication that has a specific meaning in accordance with a railway’s rules.

Automatic Block Signal

A block signal that is part of an automatic block system, actuated by a track circuit and designed to reflect track condition and block occupancy. It may be combined with an interlocking network.

Automatic Brake Valve A manually operated pneumatic valve on the locomotive that provides control of the train’s brake pipe.


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