Under the GCOR, when two trains meet at a siding and one must take the siding, which train typically has the right-of-way to stay on the main track?

1. The train traveling in the eastbound direction always has priority
2. The superior train as defined by the timetable (class, direction, and schedule number)
3. The train with the heaviest tonnage always has priority
4. The first train to reach the siding switch takes the siding