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

Back-up Valve/Hose (Monkey Tail) A devise, either portable or permanently connected to the brake pipe, for the purpose of bleeding air from the brake pipe.


A length of track between clearly defined limits, used to separate trains.

Brake Application A reduction of brake pipe pressure (no matter how made) that will cause a train’s brakes to apply.

Brake Cylinder A metallic cylinder containing a piston that is forced in or out by compressed air to apply the brakes.

Brakeman An employee who assists with train and yard operations. Duties include throwing switches, coupling and uncoupling cars, hooking up air hoses, and assisting with air tests.

Brake Pipe

That section of the airbrake piping of a car or locomotive which is the sole connecting means by which the car brakes are controlled by the locomotive engineer. The pipe extends from one end of the car to the other. At the ends, flexible hoses provide connections between the cars. When a train is made up and all brake pipes on the cars are joined together, the entire pipe system is referred to as the “brake pipe.”

Brake Pipe Pressure The amount of pressure in pounds per square inch in the brake pipe.

Brake Pipe Cutout Valve A device used on cars and locomotives to isolate the control valve from the brake pipe.

Centralized Traffic Control (CTC)

An interlocked remote control system that allows an operator/dispatcher to direct train movements over a railway line by signal indication. Typically, it gives the operator control of switches, signals, and other operating devices.

Color-Light Signal Signal hardware that uses colored lights to display aspects.

Color-Position-Light Signal hardware that displays signal aspects through both the color and position of lights.


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