Ah yes, the "Chattahoochee Choo Choo" that was the nickname of that railway, at least during World War II when my Dad was there attending O C S. IIRC they used it for troop transport such as to the rifle ranges. Dad's interest in railroads wasn't extensive but he liked somewhat oddball items such as narrow gauge operations and geared locomotives, took us to Edaville twice on family vacations. Guess that's what lit my fire of interest!