They already are. In 2003... They ran the Mel Price Lock near St.Louis from Houston and Washington DC. 2003!
That's 16 years ago. But they still need at least one person to run robot, oversee computer and two people crew for safety. So basically 2 boots always on ground.
We've been running two person crew for decades.
Bottom line... Can't go anymore "skeleton crew" than we do now. Kind of funny, I am not worried. Unlike railroads, there is still a slight human element with locks. That's already us!
Same with railroads. They will have to keep one or two pair of boots on ground for safety & security. Again... We have already been there for the past 40 years with security and safety. We actually went from a one person crew to a two person crew 50 years ago.
Yep. But they always need security guards. That, security, will be last to be automated, if ever???