@@Blitz Boom
"Well, it technically isn't a disco on wheels, but I'll be able to make it one. And the way to get inside is a button in the driver's compartment, or you can hit this button."
I hit said button and the doors hiss open, revealing the inside.
"I call it a bus and it transport ponies over great distances, much like the train, but unlike the train, it can go virtually anywhere, providing the right surface for it travel on is present."