TOFC stands for Trailer-On-Flatcar, which refers to a freight transportation system when a trailer is transported on a railway flatcar. Synonyms for TOFC include Piggyback, Roadrailers, Trailer-On-Car (TOC) and Intermodal. Piggyback refers to the loading of trailers onto a railway flatcar and Roadrailers refers to a type of trailer that is designed to be transported on a railway flatcar. TOC is the more general term as it is used to refer to the transport of any automobile, trailer or flatbed on a railway flatcar, while Intermodal talks about the practice of using multiple transportation modes for a single shipment.