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This is the same transformer as "Transformer load Walthers QTTX 4 trk well flat" less the horizontal beams of the cribbage. All other cribbage is still provided. The modeler is to provide suitable beams for the deck. The gap is .138" so use a.125 beam and add .010" packing on the top. On the prototype, there are some wood shims on top of the cross beams and the .010" gap allows this to be modeled.