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LEGO tracks are 12mm high, train wheels go below the true height of the track and so in reality only add 7mm of height. The structure gauge (also known as clearance) tolerance will obviously be a lot lower than real life. You could perhaps get away with 1/3 a brick clearance but having at least one or two bricks height clearance at minimum is best. Here are ...


Several of the trains include a diagram showing their size: It obviously varies somewhat from train to train. Somewhere around six inches or 16cm should be sufficient for most trains.

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