I can't use version 4.2, or atleast the rails that is. Why? Well, i originally built this map with railcraft tracks because they've got more possibilities ( not knowing that traincraft would update their own rails ). With traincraft tracks you can only go 90* and you can't make 45* or other angled railways. And the switches are far less handy, they take too much space.

Thanks for the feedback, good idea to add links!

I don't know about building online, i mostly build these map in singleplayer because i can work on it whenever i want without getting bothered with things like: You MUST add this and that... So annoying..
And i'm having some problems online, i can walk. But thats litteraly the only thing i can do. I can't chat, can't drive trains, i can not even open a simple door..... Gets boring quickly if you can only watch others having fun.