Having grown up in the 'elevator/escalator industry, I have heard so many horror stories about kids feet and escalators! My dad, then my ex-dh, and my brother all work in this industry. I have trained my kids to never put their feet close to the inside of the step! Don't know if this is still the case, but it used to be that if your foot or an article of clothing got 'caught' in the teeth of the step, you could bang the side of the escalator and it would stop. It somehow tripped something. But you had to really nail it...as hard as humanly possible. That was the case decades ago, I'll have to check and see if it is still the case.
But, please, keep your feet, clothing, whatever away from those teeth!! And don't take the strollers on with you...find an elevator!!! Oh, and don't let little ones on by themselves...they have no idea of what can happen and it can happen so quickly!!! Those little fingers and toes...oh,it just makes my skin crawl when I think of it.