Railworks America

I am new at this RW. I am learning a lot about designing scenarios, but I don't know how to get two trains (one AI) moving in opposite directions on a single line with passing sidings to pass each other. In the real world the dispatcher would have one or the other to take the siding while the other would pass. The US has lots of single line. It is my understanding Europe is mostly double track. The signals seem to work fine in RW when one train is following another, but not when trains going in opposite directions meet.
Also, is there a new manual out for RW3 Timetable View?

Youtube it. There are a few good tutorials showing how to set up a pass. One thing I can suggest is that you use as many go-to points as possible. Sorry I don't know the proper terms for these things but in the scenario editor, when you click on a specific train to edit it's path... that's what they're called! "Path points". The red flags. Also changing the train priority (standard freight - express freight etc..) can make a difference. Focus on the flags though. I've made a few really complicated scenarios containing all AI trains and ones with a player service and if there's one thing the AI switcher in Railworks likes it's well defined paths.

We're most definitely not all double track here; particularily in the UK we're having to spend fortunes redoubling lines that have been signalled previously. Having said that I'm not sure how you'd persuade the dispatcher to make a train optionally wait in a siding; it's easy with a loop because whichever one reaches the block ahead owns it and the other just stays where it is, but there's no conditional "if path blocked then go to this marker" option as far as I know. That would be useful.

You can obviously explicitly tell it to go there, of course.