UP Locomotive 4004, Big Boy (HFF and HBM)

This is a static display of a Big Boy steam locomotive, the largest ever built.

You can view our videos of a relative of this engine passing by at:

swansongrp.com/4014

and

www.ipernity.com/doc/2543754/49660724//in/album/1261348

The park is located in Cheyenne, Wyoming. Note the well-placed bench for enjoying the view of this remarkable machine.

There are others in static display throughout the U. S. Of course, I also have photos of the 4014, which was restored and has been running through the U. S. starting in 2019.

Thank you for all of your kind comments. Yes, this was the largest, with a combined weight (tender and engine) of over 1,000,000 pounds. It did indeed create the tractive force of two locomotives, and was created partly to prevent the need for a "double header", where two locomotives were tied together to provide more pulling power. One crew could operate this "double sized" engine. These engines were built during WW II in order to haul heavy freight over the Rocky Mountains (primarily Cheyenne, Wyoming to Ogden, Utah) at a uniform speed of 45 miles per hour. That is, they maintained that speed up steep mountains and down steep canyons. Other compound locomotives were built at that time, almost as massive as the "Big Boys". In addition, very powerful non-compound road engines were built at the same time, such as UP 844 (which see). Those engines were designed to haul pretty much anything, and could achieve speeds of 90 miles per hour.

Image processed with GIMP.