The far future will be autonomous driverless road/rail self-loading container flats which marshall themselves into trains at various access points and travel mostly at night when passenger services aren’t running.Even the mighty DB-Cargo in Germany is struggling to make wagonload economically-viable: https://trans.info/en/db-cargo-single-wagonload-415710
It seems the future for less-than-trainload lies in the domestic intermodal network with boxes transferred between trains at key terminals such as Daventry and Mossend.
