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Overview- Great
lookers.
Since the early days of intermodal transport the railroads and
freight car builders have been looking for more efficient
methods of transporting trailers and containers. One of the
greatest innovations in intermodal transportation came in the
late 1970s with the development of the double stack container
car by ACF Industries and Southern Pacific Railroad. From that
point onward the container was king and the railroads and car
builders searched for more efficient methods of transporting
containers. In a revolutionary step from the early stack car
designs, Gunderson introduced their Maxi-Stack 5-unit
articulated well car in 1988. Evolved from their previous 5-unit
Twin-Stack design, the Maxi-Stack (also called Maxi-Stack I or
Maxi-I) boasted a lower tare weight (accomplished in part by the
elimination of the bulkheads of the Twin-Stack), greater
capacity, and greater versatility in regard to container lengths
and widths that could be carried.
Initial production of these cars lasted from May of 1988 through
May of 1990 with approximately 270 cars built for Southern
Pacific, Chicago Heights Terminal & Transfer, Trailer Train,
Maersk, and the Rail-Bridge Corporation. Despite their design
advances these cars were quickly overshadowed by newer and even
larger designs, and it appeared that the final chapter on the
Maxi-Stack design had been written. However, due to
ever-increasing international container traffic, moving in
mostly 20’ and 40’ containers, the railroads took another look
at the Maxi-Stack. While the newer car designs with 48’, 53’, or
56’ wells were more than adequate to handle this traffic the
additional car length was unnecessary for hauling these shorter
containers with the corresponding excess in train length and
increased fuel consumption. As a result BNSF Railway placed
orders for new Maxi-Stack cars in 2000. While outwardly
identical to the first generation of Maxi-Stacks, these new cars
featured minor cosmetic differences compared to their earlier
siblings. As of 2007, the Maxi-Stack is still in production,
with new cars built to date for BNSF Railway, TTX, Northwest
Container, and Arkansas & Oklahoma Railway. As long as there are
20’ and 40’ containers to be hauled, the Maxi-Stack appears to
have a bright future on America’s rails.
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