The Big Boy steams under a series of overpasses en route to Green River.
At a servicing stop in Echo, a crowd of onlookers marvel at the sight of the world's largest locomotive under steam.
#4014 and #844 emerge from a short tunnel on the eastward climb several miles from the Utah-Wyoming state line.
The Big Boy and #844 stop in Granger to receive the undivided attention of both the UP steam crew and the public.
#4014 and #844 approach Morgan on the first leg of the return trip to Cheyenne.
Somewhere off the beaten path, the Big Boy leads #844 east towards Granger and Rock Springs.
