In original new "N Scale Collectible" condition. This car has never been run. There are no cracks in the box, which is the original.
A TOFC (trailer on flat car, a.k.a. piggy-back) car, was usually an 89 ft (27.13 m) car. They carried either one large, 53 ft (16.15 m), two 40-foot (12.19 m) or 45-foot (13.72 m) trailers. Most cars were modified to also carry containers.
A semi-trailer is a trailer without a front axle. A large proportion of a semi-trailer's weight is supported by a tractor unit, or a detachable front-axle assembly known as a dolly, or the tail of another trailer. A semi-trailer is normally equipped with landing gear (legs which can be lowered) to support it when it is uncoupled. Many semi-trailers have wheels that are capable of being totally dismounted and are also repositionable to better distribute load to bearing wheel weight factors. Semi-trailers are more popular for transport than full trailers, which have both front and rear axles. Ease of backing is cited as one of the semi's chief advantages. A road tractor coupled to a semi-trailer is often called a semi-trailer truck or "semi" in North America.