What determines the class of a track according to FRA standards?

The classification of a track according to FRA standards is primarily determined by authorized train speeds. This criteria reflects the operational capacity and safety standards necessary for different types of rail service. The speed at which a train is authorized to travel affects various aspects of track design and maintenance, including structural integrity, signaling requirements, and safety protocols. Higher authorized speeds often correspond to stricter standards to ensure the safety and comfort of train operations.

Factors like geographic location, track age, and the technologies used for switching can influence the overall condition and capability of the rail infrastructure, but they do not establish the fundamental class designation under FRA standards. Each class of track has specific requirements regarding maintenance, construction standards, and allowable speeds, reinforcing the importance of authorized train speeds in the overall classification process.