Various takes of testimonials by Dave Starling of In-Terminal Services and Rick Dorsey of Piggyback Services, intermodal terminal operators of Greenbrier Intermodal's Twin Stack bulkhead double stack container cars 1987.
A Step Ahead in Intermodal Railroad Equipment 1989 discusses the best use of Maxi-Stack I and Maxi-Stack III double stack container cars. Maxi-Stack I is made for International container traffic with a capacity of 124,000 pounds per well and capability to handle 220' containers or one 40' container in the wells and 40', 45' or 48' containers on top. Maxi-Stack III is considered the Terminal