In November, 1941, the Denver & Rio Grande Railroad inaugurated the Prospector, a pair of Budd-built two-car trains that went overnight between Denver and Salt Lake City via the Moffat Tunnel. Unfortunately, the trains proved inadequate for the job: with only 44 seats and 18 beds, demand exceeded capacity; while the little 192-HP Hercules Diesels were insufficient for getting the trains over the mountains. Within eight months the Rio Grande returned the trains to Budd and they were scrapped.
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After the war, the Rio Grande reintroduced the Prospector name using General Motors Diesel locomotives pulling heavyweight passenger cars painted yellow with four black pinstripes. In 1950, the train was fully streamlined, though photos of the train show that heavyweights were still used from time to time.