I used to live near Ashby Bart and would take my kid over to the station after dinner to watch the trains roll through. Sometimes we’d ride up to DT Berkeley just for the sake of riding the train. The elevators are pretty suboptimal, so I got used to saying things like “okay kiddo, stand there between the broken glass and the pee for a sec, don’t move”. She thought it was really funny that elevators were moving toilets!
I bet it would be pretty easy to take a cargo bike on an escalator, as long as you could get a good contact patch on a step and really hold the brake lever firmly. I’m currently cursed with a house that’s three steps up from the ground. Getting really good at horking the bike up and over the steps.