How is the Current of Traffic defined on a main track governed by Rule 251?

The Current of Traffic on a main track governed by Rule 251 is defined as the assigned direction of movement on that track. In rail operations, Rule 251 pertains to single-track operations where trains may encounter each other. The Current of Traffic establishes a guideline indicating which direction trains are authorized to move on that main track, ensuring safe and efficient train operations.

Understanding the Current of Traffic is crucial for train crews, as it informs them of the established flow of train movements and the necessary protocols for meeting or passing other trains on the same track. By having a clearly defined direction of movement, it minimizes the risk of collisions and enhances overall operational safety.

Other options, while related to train operations, do not capture the essence of the Current of Traffic. The preferred speed of trains pertains to speed regulations rather than directionality. The operational limits refer to physical constraints of the track, and the type of freight does not dictate movement direction but rather the kind of cargo being transported. Thus, the definition focusing on the assigned direction best encapsulates the role and importance of Current of Traffic in railway operations.