This is a well designed 3D product. Operating instructions - all pictures - no words - over 60 pages long and very easy to understand. Excellent tolerances for individual part sizes. So everything went smoothly with little problems. Keep in mind that this is not a toy, although it is advertised as something you can build and then play with. The tolerances of the pieces of wood do not match to allow the train to move. The axles are toothpicks - impossible to maintain tolerances between parts and required strength for gears to mesh without slippage. If you want to create a static model of a 3D train, this product is for you. If you are considering a toy to be played with later, then this product is NOT for you.
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