How should a train operate when authorized by Rule 556?

When operating under Rule 556, a train is authorized to proceed at normal speed, provided it does not exceed 59 mph. This rule typically pertains to situations where a train might encounter a fixed signal that is displaying a less restrictive indication, allowing the train to continue at a speed that is safe and appropriate for the circumstances, as long as it remains below the specified threshold of 59 mph.

Operating at this speed ensures the train maintains safety while allowing for efficient movement along the railway, as long as conditions permit. The focus of Rule 556 is to balance operational efficiency with necessary caution, ensuring that the train can operate in accordance with safety standards and regulatory limits.

Maintaining a speed under 59 mph ensures that if the train does encounter unforeseen circumstances, it has adequate time and distance to respond appropriately without compromising safety.