Tim? The Nelson Grey cars are identical in size to the Micro Trains versions that resulted when the moulds were sold or transferred to Micro Trains What I saw in the two pictures was a crude silicon copy of a possibly a nelson grey car minus the metal under frame? trucks, and brake wheel. The same Injection moulds were used for both Nn3 and Z nominally? 30ft in Nn3 40ft in Z? these measurements taken with my scale rulers for N and Z respectively. I visited numerous times in Nelson's basement shop, and what I saw in you photos was not even close to what I saw as scrap in his reject bin, material which was later ground up and the plastic reused. He used both black and brown plastic. At 10.00 each I can provide numerous samples with micro trains trucks and couplers and metal wheel sets True nelson grey wheel sets still have a mould sprue? tag at the centre of the axle and a junkier wheel tan the Micro trains version. The truck frames were quite fragile and none lasted in operation on my layout past 7 years. The only visual signs of a difference between NG and MT cars is Micro Trains on metal under frame on MT cars, and the axle tag on NG wheel sets.
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Garth Hamilton