A train equipped with the following speed control apparatus, a cab signal indicator, sealed application valve or switch, audible warning device and acknowledging switch, in operative condition for the direction in which it is to move.

• A. Track Car
• B. Engine (ENG)
• C. Speed Controlled Train
• D. Multiple Unit Equipment

Answer: (C)

This question tests recognizing the equipment that identifies a speed controlled train. The combination of speed control apparatus, a cab signal indicator, a sealed application valve or switch, an audible warning device, and an acknowledging switch—when these are installed and operative for the direction the train is going—defines a system that automatically governs train speed in response to the cab signals. The driver acknowledges the signal and the train can automatically apply or release brakes to match the signal aspect, keeping the train within safe speed limits.

A track car is a maintenance vehicle and typically doesn’t carry the full revenue-service speed-control and cab-signal system for its movement. An engine (the locomotive itself) is just part of a train, and while it may have controls, the description refers to the overall train’s signaling and speed-control arrangement. Multiple unit equipment describes the configuration of passenger cars together, not specifically the signaling and braking control system described. So the best fit for these features is a speed controlled train.