Photos of Tractor Trailers can be found dating from the 1920's riding on flatcars for tranport to distant cities.

    &nbspI was told Sea Container use was started by the U.S. government in the 1950's to transfer cargo to troops in Korea. But for a long time incoming Sea Containers still had to be unoaded by longshoremen when they arrrived at U.S. Ports (Job security provided by Union Contracts). Eventually agreements worked out with Unions allowed containers to be loaded directly off ships onto truck chassis or railcars.

    &nbspBut at first due to bridge clearances and low tunnels only one container per flatcar could be used. But slowly the railroads rebuilt their right of ways to allow the "double stack" concept, today the "double stack" trains are a common site anywhere in the USA and carry the bulk of freight traffic all over the USA, and move maybe 20X the amount of traffic interstate trucks move today.

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grl