What is the maximum speed through an interlocking as defined in rule 279?

The maximum speed through an interlocking as defined in rule 279 is 12 MPH. This speed limit is important for maintaining safety and allowing sufficient time for operators to react to situations within the interlocking. Interlockings are complex track arrangements that manage the movement of trains, and the reduced speed is intended to minimize risks associated with switching, signals, and other operational elements. By adhering to this speed limit, train operators can navigate through potentially complicated track configurations without compromising safety.

Understanding this rule is essential for engineers and operators to ensure compliance with regulations and to maintain overall safety in rail operations. The specified speed is particularly relevant in areas with multiple tracks and signaling systems, where precise control is necessary to prevent accidents and ensure smooth train movement.