TTAX marks as used for 89' hitch cars didn't last long... that mark was reassigned to spine cars in the early 90s, so an unconverted TTAX car in the mid 80's would be a rarity. If the car comes with circus ramps, very good chance it's NOT an 80's car.
TTX started converting 89' cars from the original 40'-45' circus load setup (i.e, both hitches facing the same direction, circus ramps) to the 45'-45' end load setup (i.e, a hitch at each end, facing inward) starting in 1981... KTTX was the prominent mark for that ... in 1984, the program was switched to the RTTX cars... same hitch setup as KTTX, now with a middle hitch added... ALL the ACF classes that got converted to KTTX were eventually converted again to RTTX.
Also, cars that had container pedestals and end hitches got TTWX marks, cars with container pedestals only got TTCX...