Union Pacific’s Big Boys

Union Pacific Railroad created the largest steam engines in the world to tackle the Sherman Grade from Cheyenne to Ogden, Utah. The articulated 4-8-8-4, if stood on end, would be as tall as a 12 story building and the engine and tender weighed 1,250,000 lbs. 

Of the 25 “Big Boys” built between 1941 to 1944, only eight of them remain, the rest were scrapped. Seven of them are on static display, and one of them, No. 4014, is being restored to working order in Cheyenne, Wyoming at Union Pacific’s Steam Shop. Of the seven on display, I would be seeing and sketching two of them: No. 4004 in Holliday Park in Cheyenne and No. 4005 at the Forney Museum of Transportation in Denver, Colorado.

The Forney Museum of Transportation is only 30 minutes from DEN, so I picked up my Grand Cherokee (I was in the true west after all) and headed to northeastern Denver.

The museum was full of vintage motorcycles, automobiles, aircraft, and bicycles but I made a B-line to the largest single piece in their collection: the impressively massive UP No. 4005.

Up close and personal with a true beast of the era of steam.

The Big Boy doesn’t get many points for style, it was function over form for this freight locomotive. It is not a beautiful engine like the streamlined passenger express engine, SP No. 4449, the steam engine I followed on excursions with my father. But what the Big Boys lacks in style, they made up with pure power and size. The Big Boy is essentially two engines in one, capable of hauling long freight trains over steep grades.

No. 4005 also bears the dubious distinction of being the only Big Boy involved in an accident. In 1953, the engine jumped a track switch at 50 mile per hour while it was hauling a 62 car consist. The engine pitched to her left side killing the engineer and fireman. The engine received massive damage but was repaired at Union Pacific’s Cheyenne facility.

The second Big Boy was No. 4004 in Cheyenne’s Holliday Park. Cheyenne actually has two of these massive engines. No. 4014 is currently being restored to working order in UP’s Steam Shop.

Union Pacific’s Steam Shop, where they are currently restoring Big Boy No. 4014 to working order. I tried to sign up for a tour but it was sold out a month in advance.

I remember my father telling me about the Big Boy on display in a park in Cheyenne and I have always wanted to see one. Once I checked in at the Historic Plains Hotel, across the square from the impressive train depot, I headed down the street to Holliday Park where Big Boy No. 4004 has been on static display since Union Pacific donated the engine to the city of Cheyenne in 1963.

The driving train and and two and the 16 driving wheels of No. 4004 in Cheyenne.

This is one massive engine! Union Pacific always goes big and the Big Boy is the tops in steam power.

A sketch from one of my photographs for Big Boy No. 4004 in Holliday Park, Cheyenne, Wy.

 

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