This enginesound was made from recordings of Southern Pacific AC-11 #4274, the last Cab Forward to run over the famed Donner Pass. 4274 was built in 1943 as one of the last steam engines new for the railroad for mixed service in the Sierras and the rest of the system. She pulled an excursion on November 30th 1957, and was scrapped later that year. Made by Train Artisan.