the perfect uniform for someone about to hop up in the cab of this big piece of classic iron. The Biggest, Most Powerful Steam Train Ever Made The UP Big Boy is a 600-ton monster of a locomotive.

There are steam locomotives, and then there’s “Big Boy.” At 604 tons and 132 feet long and with a 4-8-8-4-wheel arrangement, it is the largest, most powerful steam locomotive in the world.