alt Hacker Newshah I played for an hour this new beta. It's fun. I haven't played for years.
I couldn't workout the train signals though, there are 4 of them and they have a digit as well with them, not sure what's going on there. I'm probably not the target audience :)
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For most signalling you want the path signals. They come in 2 flavours: both kinds only do the path in one direction, one kind is non-blocking to trains running the opposite way, the other kind is blocking, one way only.
This combo lets you set up an upline and downline with a terminal station: you have one way only signals on the line, and non-blocking signals on the station entrances pointing into the station, and a crossing between. Trains will get to the end of the upline, and wait to get a path to the end of the station. Then they'll turn around and wait to get a path to the downline.
Sorry to be the one to say RTFM but … https://wiki.openttd.org/en/Manual/Building%20signals