BTW, I have quoted Trailer Train reporting mark definitions from an RMC magazine article dated August 1990. Keep in mind that there have been changes since then, but that article works for me because I am not concerned with post 1990 anyway. ATTX - 75' all purpose flatcar (center and side tiedowns) BTTX - 89' flatcar equipped with bi-level auto rack) CTTX - 89' low level flatcar equipped with partially enclosed autorack DTTX - 265' Five platform, articulated well-type COFC car capable of carrying double stack containers ETTX 89'4" low level flatcar equipped with totally enclosed tri-level autorack FTTX 89'4" flatcar equipped with tie down devices for loading automobile or truck frames GTTX 85' and 89' General American built flat car equipped with collapsible hitches and bridge plates for transportation of trailers HTTX 60' Flatcar equipped with 38 heavy duty chains, snubbers and turnbuckles for carrying earthmoving equipment ITTX 89'4" flatcar equipped with special fold away pedestals and 62 tie down winches with chains and bridge plates for carrying trailer tractors saddle back style. JTTX 50 - 89'4" flatcar with misc devices applied for lessor special service KTTX 89'4" "Twin-45" standard level flat car with fixed hitches at both ends for handling two 45' trailers back to back (over head loading only) LTTX 89' Low level flatcar equipped with collapsible hitches and bridge plates. MTTX 60-85' 60 foot flatcar with stake pockets for gen service or 85' flatcar with 16 stake pockets, 8 per side for tansporting long pipe. NTTX 249' 5-unit articulated COFC car for transporting containers (spine car) OTTX 60' Flat car equipped with 36 chains, with snubbers each secured to movable and retractable tie down winches in for longitudinal channels for transporting agricultural equipment PTTX 60' flat car equipped with bulkheads space 48'6" apart for transporting plywood and wallboard etc. RTTX 89'4" "Twin-45/Tripple 28" standard level flatcar with fixed hitches on ends of car and retractable hitch at center of car. For handling two 45' or three 28' trailers (overhead loading) STTX 89'4" "Twin-45" standard level flat car for handling two 45' trailers, equipped with sliding bridge plates for circus style loading TTAX 89'4" Standard level flat car equipped with foldaway container pedestals and hitches for TOFC and/or COFC service. TTBX 89'4" flat car equipped with bi-level auto rack, rack can be either open or shielded on the sides but does not have roof or doors. TTCX 60' and 89' flat car equipped with container pedestals for COFC service. TTDX 89'4" flatcar equipped with 16 tie down winches with chains and bridge plates for transporting military vehicles TTEX 181'9" two unit TOFC car for hauling four 45' trailers or three 57' trailers (over head loading only) TTFX 187'6" four platform TOFC car capable of carrying four 45-trailers TTGX 89'4" flatcar equipped with totally enclosed bi-level auto racks TTHX 60' 60-foot flat car equipped with 18 heavy duty chains anchored to stake picket castings TTJX 68' 68-foot 100-ton flatcar equipped with 22 screw type tie-down devices and stake pockets. TTKX 89' flatcar equipped with hinged "B" deck tri-level auto rack. Rack can be either open or shielded on the sides but doesn not have roof or end doors TTLX 89' "Twin-45" low level flatcar specially equipped by participant railroads with container pedestals or fixed hitches for assigned corridor. TTMX 68' 68-foot 100-ton flatcar equipped with stake pockets and lading strap anchors for general service TTNX 89'4" flat car equipped with bi-level auto rack without end doors but with sides and roof panels. TTPX 68' 68-foot flat car equipped with bulkheads spaced 62 feet apart and 34 transverse tied down anchors with chains used for transporting plywood etc. TTRX 89'4" flatcar equipped with fixed tri-level rack without a hinged "B" deck. Rack can be either open or shielded on the sides but does not have roof or door. TTSX 89'4" flat car equipped with coverless enclosed bi-level autorack. TTUX 50'6" Single platform TOFC car with single axle trucks capable of carrying one trailer 40-48 foot and up to 102-inches wide w/ nose mounted revering unit over head loading only. TTVX 89'4" Low level flatcar equipped with tri-level auto rack with shielded sides without end doors and without or without roofs TTWX 89'4" Twin-45 standard level flat car equipped with fold away container pedestals and hitches for TOFC and/or COFC service. TTX 50'-89' flatcar equipped with one or two hitches for TOFC service. TTZX 64' to 76' 100-ton bulkhead car equipped with center partition and winch type tie down system for carrying lumber products. UTTX 256' Five platform articulated TOFC car capable of carrying one trailer per plat forum 40-48 feet and up to 102 inches wide w/ front mounted refridge unit, over head loading only VTTX 60' and 85' flatcar equipped with fixed container pedestals for COFC service only WTTX 89'4" "Twin-45" standard level flat car with two hitches for TOFC service XTTX 89'4" flat car equipped with 4 hitches for TOFC service ZTTX 85' flat car equipped with 30 stake pockets for transporting long poles or pipes Of the 40,260 cars in service in 1978, the number of cars per reporting mark were as follows: GTTX 2260 (6%) General American design LTTX 1840 (5%) Low Flats TTAX 5750 (14%) All purpose flats TTCX 700 (2%) container flats TTX 29000 (72%) trailer only flats XTTX 710 (2%) four-hitch Triple-28s July 1982 ORER: TTX - 18,831 (AAR Type F877) WTTX - 66 (Type F877) TTAX - 11,416 (Type F077) TTWX - 0 RTTX - 44 (Type V681 & V682) << Autoracks KTTX - 44 (Type V681) << Autoracks STTX - 359 (Type F877) TTCX - 686 (Type F977) TTEX - 0 April 1985 totals: TTX - 17,492 (AAR Type P712 & P812) WTTX - 943 (Type P824) TTAX - 903 (Type P818) TTWX - 13,496 (Type P829) RTTX - 0 KTTX - 1,364 (Type P833) STTX - 738 (Type P814) TTCX - 674 (Type P736) TTEX - 0 October 1988 ORER (corrected date) TTX: 9,367 (includes some 85' and 50' as well) TTWX: 14,500 RTTX: 5,400 (all types, including channel side) KTTX: 2,750 (all types, including channel side) TTAX: 0 WTTX: 2,180 (all types, including channel side) STTX: 649 TTCX: 944 (only 445 are 89' cars) TTEX: 129 (all types, including channel side) October 1991 ORER TTX: 2,112 (includes a few 85' and prototype cars) TTWX: 14,035 RTTX: 5,099 (all types, including channel side) KTTX: 2,352 (all types, including channel side) TTAX: 2,201 (5 unit articulated all-purpose spine car) WTTX: 1,283 (all types, including channel side) STTX: 166 TTCX: 665 (only 171 are 89' cars) TTEX: 197 (all types, including channel side) Posted at MRH forums: Sun, 2017-06-04 12:49 — ctown2gn19 So after crunching some numbers I figured out the percentage of 85' flats to total flats owned by TTX. This includes 60', 87' 89', 48', 75'. Of the 53339 cars that TTX owned, 12891 of them were 85' flats as of April 1970. Now this number is sure to change after April, as the ORER's are published quarterly. So 10 years later in 1980, the numbers maybe completely different. That said, here's the complete listing of all 85' flat road numbers according to the ORER. This does not mean that all of these 85' flats were used in container/trailer service either.