You ever see the people who make sail power rail cars? They are awesome!! The pictures below some some rigs. This is been a past time for a long time. It's done a lot out in the Midwest, where there are incredibly long tracks, used 4 or 5 times a year hauling vast amounts of coat. Otherwise, they are empty. People go from town to town on them. Some pics below. I used to have a lot more modern ones. People build go carts to ride the rails, and they can be removed quite quickly if a train is coming. Most use modern Skate wheels to keep the cars on the track. A soft ride, and less friction. With the right wind, you could go faster than you may want!!
They were also used in the older days, and people had horrific crashes wen these things would reach 50 or 60 miles per hours, with the real wheels bearings, they would come apart, and the people would either die or die later as there was no system of rescue, many more made it though when the pilots kept the speed down.. A crazy part of American history not of told. Wind Wagons is what they were called, and they go way back in time, in many countries.
Wind Wagons:
Rail Vehicles