Dynamic Braking A standard freight train can have upwards of a hundred cars being hauled by one or more engines.  The BorderTransportationSystem is not designed to handle super long freight cars, but rather one to a few self-powered units that are programmed to transport freight to designated locations.  This will help eliminate massive shipping 'hump' {Classification} yards where the transported freight can sit for hours to days awaiting sufficient numbers of units to make a single destination freight train. Due to the single unit or shorter coupled together trains, the amount of braking needed to stop is dramatically reduced. {actual test will be required} Index of ... Dynamic braking (locomotive) - Wikipedia Recovering Railroad Diesel-Electric Locomotive Dynamic brake Energy Regenerative brake - Wikipedia