Why are those signals red?

[ryanguilherme]

I want to prevent the trains who come from those lines from coliding, but there is a single one train in the blue line on the other side of the map, how can i prevent this? If i put a rain signal a little bit above, the line will become yellow and the train will run only to this new signal, because the rest of the line is still blue and the signal is still red, so i cant automatize those traffics only because of a train in the other side of the map

[Nosferatu]

We cannot debug this without seeing more of the map.
Please add a screenshot of your map view with the whole train setup.
Also is the issue in your other thread solved. is that the same train network?

[Illiander42]

I'm going to make a great big assumption based on your lack of information and lack of replies in your other topic that all the blue blocks are the same block.

The solution to that is to make them not all the same block.

Or you could provide enough information that we might be able to help.

[FritzHugo3]

Here again, the simplest way signals for a Y switch. Before a chain signal and after the switch a lighning signal.