I believe that Fort Benjamin Harrison near Indianapolis also had a 24" gage line for a while similar to the one at Fort Benning and Fort Dix. It used WW1 2-6-2T trench engines. Supposedly one trench engine is still running at an amusement park in England. I know it is Baldwin, but I don't know if it is 2-6-2T or 4-6-0T. In Iowa, years ago, there were two 24" gage 2-6-2T trench engines converted to 2/5 size standard gage tender engines which ran on a guy's farm as a hobby. Two people could get in the cabs. They are somewhere in the Pacific Northwest the last time I heard. And let us not forget the 18" mining engines. Many were compressed air, but one was rebuilt as an exquisite Forney with a two man cab by a guy in Anacortes, Washington (see the tape "Big Little Railways"). He is now deceased and his will stated that the engine should go in a museum and not run again. It was THE finest convertion job I have ever seen.
--Denis Larrick