This is a very rare peace marklin history it was built around the 1950 buy marklin trains to demonstrate the power and strength of there model locomotives wonder wheel was never for sale to the public it was only to be used by the trade and businesses who sold these trains there is another 1 and it sits in Germany in a toy Museum. It's A very rare piece and if you appreciate marklin trains this would be the ultimate train set. Everything works well on it the locomotive drive large wheel round and round the wheel it comes with the locomotive and the Transformer and it's in good working condition the wheel is 133 centimetres tall. This is such a unique piece that you will never see another one this is such an amazing piece and would have amuse anybody any age