What is the proper term for a switch that allows traffic to move over it in a specific direction?

The proper term for a switch that allows traffic to move over it in a specific direction is known as a trailing point. In railway terminology, a trailing point switch is a type of turnout where a train approaches from the rear and passes through the switch towards the diverging route. This configuration allows for smooth and safe passage when trains proceed in the intended direction.

Understanding this term is important for train operators as it helps in navigating tracks effectively and ensuring safe operations. In contrast, the other options refer to different aspects of railway switches or track operations. A point of entry is the location where a train enters a section of track. The term "switch point" typically refers to the actual movable part of the switch that directs the train onto the desired track, rather than the direction in which traffic can move. A leading point is the configuration where a switch is navigated in the direction of the approach of the train, often used in different operational contexts. Recognizing and utilizing these terms correctly contributes to the overall safety and efficiency of train operations.