The invention discloses a rail amusement vehicle which comprises wheels, a vehicle frame, a suspension, a cab, a steering system, a power device, front and back anti-collision devices, an active brake system, a collision guide device and a collision reduction gear. The cab comprises the vehicle frame and seats fixed onto the vehicle frame, when the vehicle is collided with rails, the integral collision guide device transversely moves, a part of collision energy is buffered by a collision buffer portion at first, the collision reduction gear is simultaneously driven to start working, so that the speed of the vehicle is reduced, a guide reminding portion starts to act on the wheels and the steering system if the speed of the vehicle exceeds certain limit, and a driver is reminded of steering. The single-line rail amusement vehicle has the advantages that the rail amusement vehicle has collision buffer, tire protection and steering reminding functions, is low in noise and is safe and environmental friendly, and a brake speed reduction effect can be realized during collision.