What is the maximum speed a train can exceed over crossings if auxiliary lights fail?

When auxiliary lights fail, the maximum speed a train can exceed over crossings is limited to 20 mph. This restriction is in place to ensure the safety of both the train crew and any individuals or vehicles that may be near the crossing. The reasoning behind this rule is that the auxiliary lights are crucial for alerting others to the imminent approach of a train. Their failure reduces visibility and increases the risk of accidents.

By limiting the speed to 20 mph, the train crew has more time to react if an obstruction or person is detected at the crossing, and it gives other road users a better chance to see and hear the train, thereby enhancing overall safety at the crossing. This speed limit reflects an understanding that lower speeds in situations where standard safety measures are not functioning effectively can lead to safer outcomes.