------------------------------------------------------------------------------- TTX Corp. (Trailer Train) Reporting Mark Reference (12/94) ------------------------------------------------------------------------------- TTX -- equipped with hitches for trailer service (not Twin-45) ATTX -- 75-foot car with tie downs (no hitches) for ag. machinery service BTTX -- "carless technology units" (presently unused) CTTX -- roofless enclosed trilevel rack DTTX -- double stack well car ETTX -- trilevel enclosed auto rack FTTX -- auto frame service GTTX -- flat en route for auto rack installation (rarely used) HTTX -- 100-ton multipurpose flat with heavy equipt. tie downs ITTX -- saddleback flat for truck tractors JTTX -- miscellaneous specially equipped cars KTTX -- 89' car for back-to-back 45' trailer service LTTX -- Low deck 89' car in trailer service MTTX -- 60' multi-purpose flat with stake pockets NTTX -- 5-unit COFC spine car OTTX -- 60' flat with agricultural equipt. tie downs PTTX -- bulkhead flat QTTX -- heavy-duty car (multi-truck depressed center) RTTX -- 89' trailer flat (Twin 45/Triple 28) STTX -- 89' trailer flat (Twin-45) with sliding bridge plates UTTX -- 5-unit articulated trailer car VTTX -- 60', 85' or 89' COFC-only flat WTTX -- 89' elephant-style Twin 45 trailer flat (standard deck, trailers only) XTTX -- 89' trailer flat with 4 hitches YTTX -- (apparently not used) ZTTX -- 89' flat with stake pockets, in utility pole service TTAX -- 5-unit trailer/container spine car TTBX -- non-enclosed bilevel auto rack TTCX -- 60' and 89' COFC-only flat TTDX -- flat with military vehicle tie downs TTEX -- "Long Runner" (two 89' flats, drawbar-coupled for 3 57' trailers) TTFX -- "Four Runner" (4 two-axle single-trailer cars, drawbar-coupled) TTGX -- enclosed bilevel auto rack TTHX -- 100-ton multi purpose flat TTIX -- (mark listed as "retired" by AAR) TTJX -- specially fitted 68' cars w/tie downs, stake pockets, and/or fixtures TTKX -- non-enclosed trilevel rack TTLX -- low-deck trailer flat (formerly in auto rack service) TTMX -- 60' multipurpose flat with stake pockets TTNX -- single-deck enclosed autorack for large trucks TTOX -- "Front Runner" (single trailer, two axles) TTPX -- 68' bulkhead flat TTQX -- trilevel auto rack for minivans and autos (20' 2" ATR) TTRX -- non-enclosed trilevel rack TTSX -- roofless enclosed bilevel rack TTUX -- "Front Runner" (single trailer, two axles) (old mark--vacant now?) TTVX -- trilevel auto rack without end doors, with or without roof TTWX -- 89' car for 2-45' trailers or containers (flush deck) TTYX -- (apparently not used) TTZX -- center beam flatcars for lumber loading This list was developed from the _Official Railway Equipment Register_, with some corrections provided by Tim Harris . All marks known to be in use as of December 1994 are included; note that some presently-unused marks may be reassigned to new car types in the future. Consult the _Register_ for detailed information on a particular class of cars. This is not an official publication of TTX Corporation. Please send additions and corrections to Richard Hosker, or .