The track never gets dirty with this inspection vehicle! The Canadian National RR's #63321 maintenance-of-way (MOW) vehicle has room for two mini figures in the front, and all their track-cleaning gear in the back. It has headlights for operating at night and a red warning light on top so that the locomotives can see it. The roof boasts dual radio antennae. I have included a picture of an actual CN speeder so you can see what they actually look like.
Overall, this diminutive speeder can keep the track clean and clear so my RailAmerica freight train can get to its destination on time. (If you haven't seen it, search "RailAmerica"; it'll probably come up.)