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This updated version of the wagons uses the "Pin Point wheelsets" found on Tgauge.com which can be found under the spare parts page.
http://www.tgauge.com/product/253/7/2-pin-point-wheelsets - 2 wheels
http://www.tgauge.com/product/254/7/20-pin-point-wheelsets - 20 wheels
http://www.tgauge.com/product/255/7/100-pin-point-wheelsets - 100 Wheels