The last steam locomotive that Southern Pacific ever purchased is on display at the California State Railroad Museum in Sacramento. And she’s massive!

This is the only one of the 256 cab-forwards that still exist. The 4-8-8-2 locomotive was turned around so the cab was in front and the exhaust was behind the cab and crew. The natural habitat of the AC-12 Class No. 4294 was over Donner Summit. And because of the heavy snowfall in the Sierra Nevada Mountains, 37 miles of the line was covered in snow sheds to keep snow off the tracks. This innovative design prevented the crew from smoke exhaust induced asphyxiation.

This last of the cab-forwards was such an engineering marvel that it was designated a National Historic Mechanical Engineering Landmark by the American Society of Mechanical Engineers in 1981. It was the first steam locomotive to be added to the list. Of the 300 landmarks in existence, only seven are steam locomotives, including Union Pacific’s Big Boy No. 4023 and Norfolk and Western J-Class No. 611 (more about 611 in a later post).

This locomotive is massive and the largest and most powerful locomotive in the museum’s collection. The locomotive and tender are 123 feet and 8 inches long and the total weight of this Beast of the Sierras is 1,051,200 pounds (525 tons). One of the docents I talked to was old enough to see a cab-forward in action as a child and he told me that the locomotive scared him and the ground shook when it passed by.

On my visit to the California State Railroad Museum, high on my sketching list was this massive cab-forward. There was only so many perspective to sketch 4294, I tried sketching from above but I couldn’t see the entire locomotive and tender from the third floor gallery so I took a seat under the massive glass Southern Pacific logo and sketched 4294’s front and left side. My wide panoramic journal was perfect for this.