It works partly and there's a lot of things to do to make it finished. Also, there's not big demand in fact. The Quark scenery, I've reworked recently, should be ready for multiplayer by just throwing out half of one file. Anyway, multi-user-shunting is not possible, as there's no synchronization of vehicle positions. Only semaphores and switches can be synchronized and when the user drives a train on one computer, AI can do this on another, in similar, but not exact way.