What is the maximum permitted speed for trains over highway grade crossings with automatic warning devices when ABS failure occurs?

In the context of NORAC Operating Rules, when there is an ABS (Automatic Block Signal) failure, specific speed restrictions are in place to ensure safety at highway grade crossings equipped with automatic warning devices. The rationale behind setting a maximum permitted speed of 15 MPH during such an occurrence is to provide a safe operating margin that allows train crews adequate time to respond to any potential hazards or emergencies at crossings.

This reduced speed helps mitigate the risks associated with the potential failure of the automatic warning devices, providing additional reaction time to ensure safe passage across the crossing. It reflects a commitment to safety, prioritizing the protection of both train operations and the public using the crossing. Thus, the choice of 15 MPH aligns with established safety practices and procedures designed to handle scenarios involving equipment malfunctions safely.