El Gobernador was a 4-10-0 steam locomotive built by Central Pacific Railroad at the railroad's Sacramento, California shops. It was the last of Central Pacific's locomotives to receive an official name and was also the only locomotive of this wheel arrangement to operate on United States rails. At the time it was built, El Gobernador was the largest railroad locomotive ever built. Its name is reminiscent of the railroad's first locomotive, Gov. Stanford, as El Gobernador is Spanish for The Governor. This locomotive is a Mastodon type. Confusingly, this was the unofficial name for an earlier engine, "Mastodon" No. 229, the first successful 4-8-0 ever built. Both engines looked nearly identical, except that El Gobernador was longer and had an additional pair of drivers. Construction and operation El Gobernador's construction was completed in February 1883, amid much fanfare from the railroad, but it didn't enter service until March 1884, just over a year later. During this time, while still in Sacramento, the gigantic engine was used as an advertising tool by the railroad, to spectacular effect. According to author Guy L. Dunscomb, the engine was kept under steam near the Central Pacific's passenger depot, where it would await the arrival of passenger trains coming in from the east. As the train arrived, El Gobernador would steam past the depot dragging a long line of empty freight cars behind it and causing quite a stir in the process. The engine would then be uncoupled and placed on adjacent trackage, where the passengers could get a good look at the monster up close. Part of the delay between construction and operation was due to the railroad's track and infrastructure of the time. It was originally designed to haul trains out of California's San Joaquin Valley via Tehachapi Loop. The locomotive was disassembled into five large subassemblies for transportation to the pass because it was thought to be too heavy for the various bridges along the route to the pass. Operationally, the locomotive did not fare as well as was hoped due to its large cylinder size and small fire grate area (one fireman even commented in anger, "All Hell couldn't keep steam up in that engine!"). During initial shakedown runs around Sacramento, it was found, for example, that the engine's cylinders, which were originally built with innovative rotary valves, were not working properly. This necessitated casting an all-new set of cylinders with