This is a brilliantly simple tin-metal toy. No plastic is used. Easy to set up and it's splendid fun to watch it perform. You wind up the trolley car. Send it off and it climbs the "Bergbahn Mountain", comes down the mountain and then automatically makes another round trip - repeatedly until its "motor" winds down. It climbs using a proper rack-and-pinion system, just like a real mountain railway ("bergbahn" in German). See our video below for a full demonstration!
Once it starts its trip, you can't take your eyes off of it. It's just so active. Certainly true for full-on adults, and for children there's got to be some multiple of that in enjoyment. The dimensions are (length, height, width): 45-1/2"x 5-1/2" x 2-1/2". Highly recommended.