sentences:  The US has however not issued a ban on one-man-operated freight trains.In July 2013, the 55,000-member Canadian and American Brotherhood of Locomotive Engineers and Trainmen stated that they had been opposed to one-man freight trains for safety reasons since the introduction of the idea approximately a decade ago.In November 2019, eight U.S. railroads filed a federal lawsuit against the union to allow for the implementation of one man crews.