It looks like it has rubber wheels held onto the track with retractable steel guide wheels like most railroad maintenance vehicles in use today. I'm guessing th

It looks like it has rubber wheels held onto the track with retractable steel guide wheels like most railroad maintenance vehicles in use today. I'm guessing they just pull up the steel guide wheels and drive normally. From the article: "The SEFT-1 can drive on roads like an ordinary car, or use its extra set of front wheels to guide it along the rails."