Locomotives of the Burlington Route's O-5A class were built by the railroad's own West Burlington Shops in 1936-1940 and weighed 461,000 pounds. They had 74-inch drivers and 28x30-inch cylinders, and carried 250 p.s.i. of boiler pressure per square inch. These dimensions produced 67,500 pounds of tractive effort. For additional specifications see the page for No. 5621 following. This image of No. 5618 came from Frank Fabian via Wayne Koch. There is no information about date, location, or photographer.