If train 6156 encounters a speed failure after cutting out speed control, what speed can it proceed at?

When a train encounters a speed failure after cutting out speed control, it is typically required to operate at a reduced speed to ensure safety. The correct speed in this scenario is 40 mph. This speed allows the train to maintain control and safely navigate any potential hazards while acknowledging the situation of the speed failure.

In cases of speed control issues, regulations are in place to minimize risk and ensure a safe operation, and 40 mph represents a reasonable compromise between maintaining schedule efficiency and ensuring safety protocols are followed. The other speeds listed, such as 60 mph, would exceed the safe limit under such conditions, while speeds like 30 mph or Restricted Speed may not align with the operational requirements for this specific situation. Thus, under the LIRR Operating Rules, the appropriate action would be to proceed at 40 mph following the criteria established for speed control failures.