The Wabash Railroad had a total of 38 Moguls built in 1899, which came from three manufacturers and were initially classed as class I. 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 in Rhode Island and Richmond were five two-cylinder compound locomotives which later became the class F-5.