It seems I still have to get used to these signals.
there was some stuff i was unable to build because I was used too much to the style of "normal" signalling in OpenTTD. Some of the screenshots posted in this thread afterwards already helped me, but I think I'd need some really good tutorials on PBS to fully understand how to use it
Well, good luck with developing it further then
The main new rule is that you are only supposed to place signals in locations where trains are supposed to wait. Assuming you don't want trains to block intersections while waiting, this means you should only place signals before intersections and never immediately after intersections, so that trains always wait in front of the intersection and never inside it. Of course, if you enjoy trains blocking intersections, you can continue placing signals the traditional way
The other important rule is that you should always place a signal in front of every platform to prevent a train from leaving the platform when the track is not clear. I had several crashes because I had forgotten to do this
Also, I don't recommend mixing traditonal and PBS signals or to at least keep them on seperate track networks. Otherwise, you will have many issues with train collisions, because they seem to not be compatible. When upgrading your old signals to PBS, I recommend sending all trains into the depot beforehand. Otherwise you will have many train collisions. Only let the trains out of the depot again after the entire track network has been upgraded to PBS signals.
Maybe the easiest way to learn the new signals is to see them in action. In the attached savegame, I demonstrate the power of the new PBS system. Please note the station layout of Little Gratfingford Heights, which is in the center of the screen when you load the game. The junction in front of this terminal station offen allows up to 3 or 4 trains at the same time inside the junction. Also note how I designed the track to the far-away station. I have two tracks in every direction. With traditional signals, I had to leave one tile between both tracks in order to place signals in places where you swap from one track to the other. However, with these new PBS signals, this is no longer necessary.