Red signal - how to change to green

[spammu]

How do change a red signal to green when a train stops

 

[AntonyVW]

under AI or manual control?

 

[oknotsen]

By making clear the path ahead is safe.

 

[JCitron]

You need to ensure that the switches (junctions) are set for the route of the train and that the route is clear. If there are any broken tracks, misaligned junctions, or on coming traffic, the line will be closed.

John