TTX was established in 1955 as “Trailer Train,” and as their business evolved simply became “TTX” in a 1991 rebranding effort.Seasonal promotion..N Scale - Heavyweight Flat CarThis heavyweight depressed-center flat car was built in the mid-2000s and used to carry oversize and heavy industrial loads, such as transformers, stationary power plants, and substation equipment.Verified secure. The lowered center of the car allows for necessary overhead clearance for the lading