For much of the 1920s the Uintah was headed by Lucian Sprague, a railroad executive who later became well known for orchestrating the dramatic turnaround of the bankrupt Minneapolis and St. Louis Railway. In 1926 the railroad purchased an articulated locomotive, #50, which was specifically designed to handle the extreme curvature and steep grades of Baxter Pass. The idea was that this new locomotive would do away with the need to change engines at Atchee and Wendella. The single articulated locomotive could move as many cars as two Shay locomotives from Rainbow to Atchee and made the trip in half the time. After some initial modifications, this engine proved to be such a success that in 1928 the railroad purchased a sister locomotive, #51. These were the only narrow gauge simple articulated locomotives sold for use in the United States.