The post discusses the concept of 'Rolling Highways'—specifically the transportation of freight or vehicles that can be either trucked or transported via rail. It highlights that traditional methods like roadrailers and other transport schemes have largely been phased out in favor of containerized freight. Double-stack container trains are noted for their efficiency, being able to carry significantly more cargo compared to road transport. The user comments also propose a creative idea regarding the possibility of placing trailers on rail cars, indicating a level of innovation thinking around freight logistics.