Vintage Road Champs? Die Cast 1:48? Interstate System Semi Truck Tractor Trailer

Up for sale, a Vintage Road Champs? Die Cast 1:48? Interstate System Semi Truck Tractor Trailer I have whole collection of these trucks and no idea what they are. They have no brand markings. They seem to roughly 1/48 scale. they were used on a O gauge model railroad and are 14 inches long in total. The trucks are die cast, trailers are plastic. This one in particular is in overall good shape with light wear and age (See pictures). Original box not included. Please Note: This model is being sold As Is. But, I would be more than happy to answer any questions or concerns you may have.