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This is the thread I mentioned. It includes a photo do the wheels, but no part numbers. I also don't have part numbers for both types of the ribbed-back wheels. For all I know, trucks using both wheel variations might have been sold under the same part number.One of the posts in that thread speculates that those were discontinued due to broken/worn molds.
Rarely seen these days and prone to corrosion issues, the black Delrin plastic axle cast metal rib backed wheels were marketed by Kadee Quality Products as stock number MT-1057; blister card packaged twelve-packs of factory assembled replacement wheel-sets, or, found on pairs of factory assembled, blister card packaged stock number MT-1000 Bettendorf trucks with an MT-5 Magne-Matic knuckle coupler that was held in place by a steel screw.Never factory installed on any of the Kadee Micro Trains production rolling-stock, the aforementioned MT-1000 trucks and MT-1057 wheels were supplanted by the more commonly seen, screw-less truck frame with cast metal axle and Delrin wheels that were introduced on Kadee's 1972 release "Blue Label" models.
peteski,Focused on the evolution, historical, and production aspects of model products, I couldn't help myself.While blister packages of the later iteration of rib backed wheel-sets retained the MT-1057 stock number for approximately four more years, during a round of stock number changes for the entire Kadee product line (e.g., MT-1057 became 1007, MT-5 became 1025, and MT-1050 became 1311), all of the packaged "Kadee N Gauge" accessories, couplers, and trucks had the "MT" prefix dropped in 1976.
Thanks Neville! So it is possible for the MT-1057s to contain either type if the 3-piece rib backed wheels.
@pmpexpressYes, thx Neville. As an aside, your ebay buyers guide on Kadee /MTL is a great resource. For those that might not have seen it yet, see http://www.ebay.com/gds/Kadee-Micro-Trains-MTL-1-160-N-Scale-Variations-Guide-/10000000003822658/g.html