Railfans dot the trackside landscape as the Union Pacific's Big Boy 4014 runs through the S curve at Rock River, Wyoming.

ROCK RIVER WY Sept 24 1978 — Union Pacific SD40-2 3473 rolls across the Wyoming country in the lead of a mixed freight. EMD built the unit (b/n 776088-64) in April 1978. Corrections welcome. My ... (more)

The hot Global 2, IL to Brooklyn, OR Z-train races down grade at Rock River. Unlike the low priority trains that run on the Laramie Sub, this Cheyenne crew will run-thru the normal crew changing l... (more)

Eastbound and westbound meet on the undulating geography near Rock River, WY.

Forever West: A long string of empty covered hoppers for soda ash loading are returning to Green River, WY as the train rolls down the grade from Lookout toward Rock River near MP601. A pre-Inters... (more)

Geographically north (railroad west) of Laramie, Wyoming, the Union Pacific Railroad negotiates a series of low hills. Approaching the small community of Rock River, westbound trains descend into... (more)

UP 4014 and UP 844 head westbound on UP's Larimie Sub,. The train is just east of Rock River, WY.

UP 4014 and UP 844 head westbound on UP's Larimie Sub,. The train is just east of Rock River, WY. May 4, 2019.

East of Rock River a eastbound stack works it's way along the Laramie Sub.

UP 4014 & 844 are about to drop downgrade and head into the tiny town of Rock River, WY

Climbing a grade out of Rock River, Union Pacific 4014 and 844 cruise along at track speed with their passenger Car Special.

UP 1995, the Chicago and North Western heritage unit, leads the Global 1, IL to Los Angeles, CA intermodal train into Rock River after tackling Sherman Hill.

Union Pacific's Big Boy 4014 makes history with it's triumphant return to steam as it makes the run to Ogden, Utah and is seen approaching Rock River, Wyoming on the much anticipated date of May 4... (more)

UP 4014 makes its way through a cut right before it descends in the small town of Rock River, WY which saw an unbelievable amount of traffic for about an hour following Big Boy west to Rawlins for... (more)