What is the term for the movement of trains in one direction on a main track?

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The term for the movement of trains in one direction on a main track is referred to as "current of traffic." This concept is crucial in railway operations as it helps in managing train schedules and maintaining safety on the tracks. By designating a specific direction for train movement, it ensures that trains do not encounter each other on the same track, significantly reducing the risk of collisions.

In most rail systems, having a current of traffic allows for efficient flow of trains, optimizing how multiple trains can use the same track infrastructure while maintaining a reliable service. This practice plays a fundamental role in operational planning and signaling protocols, ensuring that train movements are coordinated according to predefined rules.

The other options relate to different aspects of rail operations. Double track refers to having two tracks for trains to move in both directions, interlocking is a signal system designed to prevent conflicting movements, and the block system is a method used to divide the rail track into sections to manage safe distances between trains. These concepts support various aspects of train operations, but do not specifically define the directional movement of trains on a main track.

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