To also give my honest opinion on this thread....
I think it's an absolute shame to kind of demand the release of the singleplayer.
As my predecessors already stated, yes we have a Roadmap but this doesn't mean there's always everything running smoothly... especially at a release of a new version of a product, there are many things that could go wrong!
I'm speaking from experience myself.
I really trust the devs of SimRail and I'm also not a little bit sad about the delayed release, because you could really feel that the devs are currently giving everything to give us a decent update...
I mean the forum activity of the devs speaks for itself, normally they're very active and If they don't..... that's either a sign that they really work hard or they're just taking a break (which is absolutely understandable and fine; @SIMRAIL-Team: Please take the time you need and also take a break here and there ^^).
With this said, I wish you everything good and hope you have a nice time in SimRail!!