Interlocking signals prevent which problem for the requested route?

• A. Wrong speed limits being applied.
• B. Unnecessary delays due to excessive braking.
• C. Conflicting movements by locking signals and switches in safe positions for the requested route.
• D. Over-communication between train crews.

Answer: (C)

Interlocking systems coordinate signals, track switches, and related devices so a route can be set only when everything along that path is safe. When a train requests a route, the interlocking ensures all signals and switches that define that route are locked in the safe positions, preventing any movements that could conflict with other trains or routes. This is exactly what prevents two trains from moving toward each other or being steered onto incompatible paths at the same time.

That’s why this description is the best match: it directly states that interlocking locks signals and switches in safe positions for the requested route to avoid conflicting movements. The other options describe issues like speed control, braking-induced delays, or communication, none of which capture the protective locking function of interlocking.