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Convert your N Scale Atlas SD35 into an SD20.
Most SD20s were converted from first generation SD7s and SD24's. A few, however, were converted from SD35s. Engines were given 645 power assemblies, and deturboed, with the unique "liberated exhaust" configuration with 4 stacks. Additionally, a new cab and nose were installed, which had the flat front unique to chop nose first generation units. This kit includes a replacement short hood nose, and a non dynamic hatch with "liberated exhaust".
See images below for more details on how to do the conversion.