I know I'm a /bit/ strange, but one thing that I've always been curious about is how much it costs to replace the massive windscreens on buses and coaches.
If you look at the windscreen on a StreetDeck it's curved in pretty much every direction and is huge, it must cost an absolute fortune to replace one if it gets cracked.
RE: New StreetDecks & ADL Enviro400s - X-lines fleet changes