Union Pacific Big Boy No. 4014 passing the wye track at Cache, Utah. 

In Cache, Utah. We waited for the 4014 to come through the foothills along the Cutler Reservoir.
Then 15:00 minutes later, we filmed Big Boy on top of the pick up truck to get a better view and when the Big Boy was getting closer to the junction his whistle was really loud, even a few hundred yards away from us it is louder than a Diesel Locomotive compress air horn.
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