Immerse yourself in railroad history with this original 35mm color slide featuring a striking Denver & Rio Grande Western (D&RGW) locomotive, number 3155, at a station in Denver, Colorado. The powerful black and yellow "Rio Grande" unit, likely operating under Union Pacific (UP) at the time, is captured with exceptional clarity against a vibrant blue sky, showcasing the iconic livery that makes D&RGW trains highly collectible. This detailed image provides a fantastic glimpse into rail operations in the late 20th century, perfect for train enthusiasts, railroad historians, and slide collectors.

The slide mount is hand-labeled with key details, including "UP G&S Sky Train DENVER, CO" at the top, confirming the location and context. The date "APR 6 1997" is clearly marked, pinpointing the exact moment this scene was preserved. Additional markings like "A1769" and "3155, 3156, 17c" offer further provenance, potentially referencing other locomotives or slide sequence. This vintage transparency is an excellent piece for anyone interested in North American rail transport, D&RGW memorabilia, or collecting historic photographic slides.