Assertion: elevator's door | /r/HasProperty | double-ended
Facets:
value: double
type: DEGREE
Source sentences:
text: The elevators at the Millbrae (California) BART/Caltrain station have double-ended doors, but use only the front-door open/close symbols, which works because only one set can be opened at a time, so this obviates the need for different front/rear door buttons.