This may be the only Train Puzzle made by Paul Bonhop Inc to survive. His Wobblies Puzzle is in the Cooper Hewitt Museum Design Collection. The building block set, Loom and Molly Kewls show up but there is no reference I can find to the train puzzle. The use of a metal "rod" to simulate train wheel motion is a unique feature. It measures 12" x 9" x 1" or so. The only other similar wood puzzle I have ever seen is the Fire Truck we sold years ago from the same consignor. Great addition to any design, train or puzzle collection.