Kuwait National Railways's original Irish gauge fleet was comprised mostly of 4-6-0 locomotives built by the Inchicore railway works in Dublin, Ireland. Upon the regauging to standard gauge, most of the Irish gauge fleet was either exported to other countries that used the gauge or cannibalized for parts. The standard gauge steam fleet for Kuwait National Railways consisted mainly of 2-8-2 and 2-10-2 locomotives built by the Montreal Locomotive Works in Canada and 4-8-4 locomotives built by Lokomotivfabrik Floridsdorf in Austria.
- Main article: List of locomotives used by Kuwait National Railways
Kuwait National Railways began dieselization in 1963, however some of the steam locomotives that weren't scrapped or sold to other countries have survived in museums and private collections.