Mark Description
BTTX Bi-level rack
CTTX Auto rack.
DTTX Double-stack well car.
ETTX Tri-level auto rack.
FTTX Equipped to carry automobile or truck frames.
ITTX Saddleback flat for carrying trucks.
JTTX Miscellaneous Service
RTTX Tri-Level Rack
TTBX Bi-Level Rack
TTCX Container-only.
TTDX Military Equipment
TTRX Tri-Level Rack
TTX 2-Hitch TOFC
XTTX 4-Hitch TOFC