A roadway maintenance machine, not classified as an engine, which is operated on track for inspection or maintenance. It may not shunt track circuits or operate signals and will be governed by rules and special instructions for trains other than passenger trains.

• A. Block Signal System
• B. Engine (ENG)
• C. Track Car (TC)
• D. Automatic Speed Control System

Answer: (C)

The concept tested is recognizing the on-track vehicle used for maintenance that isn’t a locomotive. A roadway maintenance machine that runs on the rails for inspection or maintenance is classified as a track car. It’s designed to move along the track for work tasks but is not an engine, so it isn’t allowed to shunt track circuits or operate signals. Instead, its operations are governed by rules and special instructions for trains other than passenger trains, keeping maintenance work separate from regular passenger service. The other options describe a signaling system, a locomotive, or a speed-control system, none of which fit the description of a maintenance on-track vehicle.