Elevator outages on Metro could be shown:
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as an indication (such as a crossed out elevator and stop name) on the destination bar for trains going in that direction. This is the cleanest interface.
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as text at the bottom of the screen, which helps prevent someone needing elevator service from starting a trip to a station lacking it. Of course, Metro already displays elevator outages within stations.
There is an API for this information but reports are not necessarily standardized.