What is the determining factor for which train should go first at a junction where two routes converge?

The determining factor for which train should go first at a junction where two routes converge is primarily based on the schedule. Trains are typically operated according to a predetermined timetable designed to manage traffic and minimize delays. Therefore, the train that is scheduled to arrive first at the junction has priority over the other train.

This scheduling priority is crucial in maintaining the overall efficiency of the rail network. When two trains approach a junction simultaneously, the one that is on the timetable to arrive first will be given the go-ahead to ensure that its journey remains on schedule. This prioritization supports effective train operations and contributes to keeping the rail system orderly.

In contrast, factors such as the length of the train, the weight of the train, and the speed of the approaching trains, while they may influence operational considerations in certain contexts, do not dictate priority at a junction as clearly as adherence to the established schedule. These aspects are more relevant for train handling and safety procedures rather than for determining which train proceeds first.