For users to drive: the class 08 shunter (I wonder if Derek is already working on this). As AI, or even static: Central and Hammersmith & City tube stock, just to make the tube lines look "active" Heathrow Express (no point making it drive-able at this moment in time) Also, may I suggest a Boeing 737 or other aircraft, I'm sure I heard a plane whilst on walkabout,but couldn't see anything... cheers John