IMHO, it seems a reasonable approach to utilizing technology to improve productivity, especially if confined to use in switchyards. Safe operation is the primary consideration, so implementation becomes much more difficult, if not impossible, outside the controlled surroundings of the switchyard.
Interestingly, the dedicated, elevated guideway utilized by Maglev eliminates the major obstacles to employing such automated technology in actual travel between destinations. I don't believe that actual "engineers" are needed to operate Maglev, although I would think "conductors" would be on board to provide necessary service to passengers.