What is a fundamental requirement regarding track permits?

The fundamental requirement regarding track permits is that they must specify authorized locations. This is essential as track permits provide crucial information about where work can safely be performed on the tracks without interfering with train operations. By specifying the authorized locations, the permits ensure that all personnel are aware of the limits of work areas, which enhances safety and minimizes the risk of accidents.

Understanding the designated areas prevents any unauthorized access to sections of track that may still be in use by trains, thereby promoting a safer working environment for maintenance crews. Clarity in the permit specifications is critical to proper operational planning and execution, ensuring that all parties involved have a clear understanding of their work limits.

In contrast, the other options do not convey the primary focus of track permits. Permits are not typically required for every train movement or optional during inspections; rather, they exist as a regulatory framework to manage safety during maintenance operations. Additionally, permits should be obtained prior to work, rather than retroactively, as doing so could undermine the whole purpose of permitting and could lead to safety violations.