These 4 smooth side ACF sleepers were delivered to GM&O in 1950.  The mixture of 3 Bedrooms, 1 Compartment, 8 Roomettes and 4 Sections made these cars one of the most unusual lightweight sleepers ever built.  They were used on the "Alton Limited, Midnight Special, and Gulf Coast Rebel."  For some reason, the railroad chose to put 6-wheel trucks on the coaches and 4-wheel trucks on these cars.  Their disposition is not known.