Where shoving movements are authorized by the RTC on main tracks, controlled sidings, or any track where CTC is in effect, the speed must not exceed:

• A. 10 MPH
• B. 20 MPH
• C. 30 MPH
• D. 40 MPH

Answer: (B)

Shoving movements carry higher risk because the locomotive pushes the cars from behind, often with limited visibility of the track ahead and with braking and stopping dynamics that differ from pulling. When the RTC authorizes these moves on main tracks, controlled sidings, or any track under CTC, a specific speed limit is set to ensure there is enough stopping distance and time to react to signals, switches, or unexpected conditions while maintaining safe control of the movement.

Twenty miles per hour is that limit here. It provides a workable pace that keeps the train maneuverable and responsive to indications from the control system and track conditions, without pushing the limits of stopping ability. Speeds higher than this would increase the risk of overrunning signals, misreading track conditions, or losing control of the shove, while much slower speeds would unduly hamper productivity.