Gunderson introduced their MAXI-I articulated cars in 1988, with the first run lasting until 1990. During that time, 270 cars were built for railroads such as the Southern Pacific , Trailer Train, Maersk and Rail-Bridge. The cars could carry two 20’ containers or a single 40’ container in their well. A larger 48’ or even 52’ container could be positioned on the lower container.