MAXI-I is a multi-unit well car designed to carry two stacked intermodal shipping containers. While its base well is 40′, it can accept larger containers such as 45′, 48′ and even 53′ in the top position, making the car a versatile addition to a railroad's intermodal services. The MAXI-I is a five-unit well car, unlike its 53′ cousin, giving each car a greater capacity even though the individual wells are a smaller size.