Mitch Hedberg said it. An escalator can never break — it can only become stairs.
I think about this more than I should. Most machines fail violently. A car stops; you are stranded. An elevator dies; you are trapped. A washing machine seizes; you spend the afternoon at a laundromat. Failure costs you something — time, distance, the contents of an open jar.
The escalator has the only failure mode I can name that degrades into its own pre-mechanical ancestor. When the motor quits, the steps are still there. The handrail is still there. The angle is still there. It is, instantly and without fanfare, a staircase. The function survives the failure.
There is some quiet humility in a machine whose broken state is still useful. We have not asked for many objects like this. A dead microwave is not a cold oven. A dead car is not a heavy bicycle. A dead phone is not a paperweight that talks to people in the building.
Maybe the better goal isn't smarter recovery. Maybe it's a more useful version of what a thing becomes when it stops. Most of our machines fail into uselessness. The escalator fails into something a human had already invented.
The "Out of Order" tape on a stalled escalator is absurd every time. It is not out of order. It is being stairs.