The Wabash Railroad had a total of 38 Moguls built in 1899, which came from three manufacturers and were initially classed as class I. A total of 18 locomotives were built by the Richmond Locomotive Works and Baldwin and had a large firebox for their time and a relatively small boiler. 15 other locomotives came from the Rhode Island Locomotive Works and had a larger boiler. All of these simple-expansion locomotives were later classified as F-4. Also built by Rhode Island and Richmond were five two-cylinder compound locomotives which later became the class F-5. 