Big Boy No. 4014 can look quite nice inside a museum, but this gigantic steam locomotive of the Union Pacific company weighs about 1.2 million pounds and is 133 feet long… It is amazing how in 2026 it completed its first coast-to-coast journey in 2026, traveling through 14 states during the famous United States’ 250th anniversary celebrations.
There was a moment in which the company had to step in to give explanations because people doubted whether the diesel locomotives hanging at the back were secretly doing the job.. They answered saying that the diesel motors just helped to stop, manage in stations and to prevent deterioration.
A 1.2-million-pound machine built for mountains
In the 40s, American Locomotive Company was asked by Union Pacific to build 25 of these locomotives, but with the specific need to cross the Wasatch Mountain in Utah and steep rail corridors in Wyoming for trains with gigantic cargo, something that usually for other trains can be quite difficult and requires them to work in teams. What was amazing about this was that one Big Boy could pull a train with 120 freight cars with 3,800 tons at 40 miles per hour.
Why diesel locomotives traveled behind Big Boy
The company took a “practical decision” by including diesel motors (although of course the Big Boy can work perfectly well alone). These engines actually have a modern system that avoids the old brakes of the Big Boy to deteriorate… They are extremely expensive and difficult to replace.
But that is not the only reason. The diesel helps give the Big Boy what the company says “more autonomy if it’s needed” to the water tanks in special auxiliary cars.
No. 4014 returned after decades in retirement
It is very nice to see actually how Union Pacific in 2013 bought it again, and after spending years and years restoring it, it was in 2019 that it started working again (and think that in 1961 was the last time that it did its service logging 1,031,205 miles).
From the 25 that were built, only 8 of them survived and the No. 4014 is the only one in the whole world that is still working. So seeing it passing around is a whole sensorial experience.
Inside the cab, the 1940s are still alive
And this gets even better because as the heritage operations manager Ed Dickens said, everything inside works manually and nothing is automatic. It seems that inside the cabin is like traveling back to 1940. It is at such a level that the crew members need to protect their eyes and ears to work and, of course, to constantly drink water due to the heat of the firebox. The difference (and I guess that is the best thing about it) is that the fuel is no longer coal; now it is Fuel Oil No. 5, but what makes the train move is still the steam generated.
A 7,000-mile trip became a national spectacle
The 2026 journey that started near Central Pacific’s historic Milepost Zero in Sacramento and later moved east ended up being a spectacle and an event that people liked to experience. The Big Boy appeared in many cities, such asOmaha, Buffalo, Scranton, Philadelphia, Altoona, Fostoria, and St. Louis.
To be precise, for example, tens of thousands gathered around the locomotive during the July Fourth celebration in Philadelphia!
More than nostalgia on steel wheels
With all this “event in movement” people start feeling that it was such an experience because all the modern trains have everything hidden and you only see the computer screens, and the Big Boy shows you everything: you can see the pistons moving, the wheels spinning, and the amazing steam. And this is very symbolic, since people could see how our ancestors solves gigantic engineers problems.
What happens next for Big Boy No. 4014
As the national 2026 trip ended, the Pacific Union asks fans to be aware of the official announcements of the stean train club (Steam Club) to know when it will be back on the railways..
The latest official update was published on Union Pacific.
