Are we confusing a college degree with skill? I can't speak to what all of BART's employees do - but electricians, mechanics, machinists, etc, all do not requi

Are we confusing a college degree with skill? I can't speak to what all of BART's employees do - but electricians, mechanics, machinists, etc, all do not require a college degree, but are all very much skilled work. Hell, as a bit of a transit nut I also know that driving a train is way more complicated than pushing the throttle up. Again, what does a college degree have to do with anything?