NRE 3GS21B GensetThese are N scale 3D printable files for the National Railway Equipment (NRE) 3GS21B Genset locomotive in Union Pacific Railroad markings one of the most innovative and environmentally significant locomotive designs of the 21st century. Designed to fit on an Atlas B23 7 frame. Includes UP decals. The Genset locomotive concept was developed in the 2000s as a direct response to increasingly stringent EPA Tier emissions regulations targeting diesel
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