Not quite what you're talking about, but see: https://en.wikipedia.org/wiki/Central%E2%80%93Mid-Levels_escalator_and_walkway_system https://en.wikipedia.org/wi

Not quite what you're talking about, but see: https://en.wikipedia.org/wiki/Central%E2%80%93Mid-Levels_escalator_and_walkway_system https://en.wikipedia.org/wiki/Central%E2%80%93Mid-Levels_esc...