Union Pacific Big Boy Train climbing Donner Pass in the Sierra Nevada Mountains California 

The historical Union Pacific "Big Boy" 4014 steam train set makes it way up Donner Pass in the Sierra Nevada Mountains in Northern California. Part of the UP heritage fleet it made its premier in the forests of California on a hot summer day with a plume of smoke and a howling whistle, plenty of people came out to watch the train chug along.
with audio ( 4k )