That is neat!
I wish there was something like that at the Carlsbad Caverns as that would save a lot of the long walks around. When I visited the Crystal Caves in MO, they had a small Propanes-powered tractor pulling small carts which we rode in a system like this would be a lot better there too.
The squealing wheels sounds on those curves sounds like Boston's Green Line trolley line when coming into Boylston or Park Street.
