The phrase "working elevators" refers to elevators that are functioning properly and can transport people or things between different floors of a building without any problems. Full definition
Dear visiting NYC anytime soon, I thought Taza's New York City guide to transportation was really great (especially the unbelievably helpful map detailing all of the subway stations with working elevators.) (glitterinc.com)
I found out that the Montecito Inn, built by Charlie Chaplin and a small group of investors, houses California's oldest working elevator! (onegirl-oneworld.com)
In those days of merrily playing in the attic, I remember fervently wishing for everything that Malibu Barbie had: I wanted my own Ken with his permafixed smile, perfect hair, and a Barbie Dream House to play in (complete with working elevator). (thedressedaesthetic.com)