Jim Thomas partnered with John Tyler to form Mantua back in the late 1920's building small motors ...growing into one of the leading manufacturers of HO in America by 1938.
Jim Thomas leaves Mantua in 1947 to form Thomas Industries manufacturing O scale trains .
The O scale market was very small compared to the ever growing HO world he helped create.
Thomas initially offered a scale 040 switcher and Consolidation steamers ...but with lagging sales turned to tinplate in hopes to find larger audience.
Thomas Industries moved from NJ to Shawnee ,Ok about 1951..plans for an old time Civil War era train were announced.
Cars were produced early but the engine was not under steam until mid 1953.
The Thomas lead the "tinplate " world with a Civil War era train ...American Flyer , Lionel and Marx would all join the field in 1959...one year after Jim Thomas had passed away.
Please see link for Thomas O gauge Shawnee Express in motion . AC operated with reverse unit.
Cheers Carey