Great Western 90 is a preserved 12-42-F class 2-10-0 "Decapod" steam locomotive owned and operated by the Strasburg Rail Road (SRC) east of Strasburg, Pennsylvania. Built in June 1924 by the Baldwin Locomotive Works, No. 90 originally pulled sugar beet trains for the Great Western Railway of Colorado, and it was the largest of the company’s roster. On April 5, 1967, No. 90 was purchased by the Strasburg Rail Road, who were looking for a new engine to pull the ever-increasing train loads, which was becoming too much for No. 31, Reading 1187 and Pennsylvania Railroad 1223, doing its first test run on May 13.