When Trainz 12 goes bad

I decided that since the Trainz 12 SP1 Patch was just released and installed, I was going to try the Southern China Passenger Session. Before SP1, I had never been able to complete the session as the AI trains in front either go stuck or came off the tracks - either way, the game blamed me for stuffing up.

So I load up the session and I see... This...

Oddly enough, the locomotive still happily pulls the train, despite the obvious gap...

Edit: Well this is new... Apparently this is happening at the back of the train...

Edit 2: I'm starting to think I have a database corruption...