I know it seems like a small barrier to automation but there's still the labor issue. I'm very pro-union but I draw the line at people working jobs that don't need to exist. NYC's L train is basically completely automated but they still have to have an operator and conductor because of the labor agreements. SEPTA can't even get rid of the token booth position, good luck ever getting rid of the operator position. And I'm slightly furious that I have to cross Spring Garden to enter to BSL because of a stupid labor contract (they can't open the turnstiles unless there's a token booth employee present).