That track in the tunnel is a health and safety NIGHTMARE. I lost loads of my stuff when I crashed into a runaway cart at speed.
So I'm building runaway cart detectors. Don't panic, if you're bombing along and you're in a cart you'll go straight on. If a cart has no occupant it will be taken off the track and stored :Y
EDITED: 21 Feb 2011 18:50 by MOUSE