Absolutely incredible !
The small insert with the Jones boys on the motorcycle in front of the road sign post made me laugh instantly
I must say, a bit peculiar concept for the mine cars; but although I am a huge LEGO fan myself, I simply don't hold that ammount of spare parts to build a track that long (and varied in orientation)...
I've actually always dreamt of trying to recreate the entire Doom underground set, including the sacred altar of the Thuggees, the mining processing facility and the tracks... but surely the amount of levels and the fact you can only make an intersection some 20-30cm across... It'd take some imagination to see it through and let go of true spatial accuracy.