What speed can an MU train proceed at in 409 territory when experiencing a speed failure that does not display a cab signal indicator?

In the context of operating an MU train in 409 territory, when a speed failure occurs and the cab signal indicator does not display a signal, the established protocol indicates that the train can proceed at a maximum speed of 30 MPH. This limitation is based on safety measures that are in place to ensure the train can stop effectively within a given distance, especially when approaching potential hazards or obstructions.

Operating at this speed allows for a balance between maintaining train movement and ensuring safety when facing an ambiguous signaling situation. Exceeding this speed could increase the risk of incidents, as the crew would have less time to react to unforeseen circumstances or obstacles on the track.

The knowledge of the prescribed speed in such scenarios is essential for train operators to ensure compliance with safety regulations and to operate within the limits set forth by the LIRR Operating Rule Book.