Which signal indicator located in the engine control compartment displays the maximum speed for the movement of the train?

• A. Fixed Signal Indicator
• B. Cab Signal Indicator
• C. Indication
• D. Block Signal

Answer: (B)

The main idea is that the train’s speed authority comes from signals read inside the cab. The Cab Signal Indicator is the instrument in the engine control compartment that shows the cab signal information—essentially the maximum speed permitted for the current movement. As you approach signals and as authority is updated, this indicator reflects the allowable speed so the engineer can adjust throttle and braking accordingly.

The other indicators relate to different signal concepts: a fixed signal indicator would reflect the fixed trackside signal, not the current in-cab speed limit; a block signal is about block occupancy and does not convey the speed limit for the whole movement; and a general indication label is too vague to specify the in-cab speed.