How does this affect my trip? The Rosemont station's mezzanine-to-platform ‘up’ escalator is temporarily out of service. Entry to the platform is available by the stairs and elevator. The ‘down’ escalator for exiting the platform remains in service. The escalator is estimated to return to service on Monday, November 19, 2012 (date subject to change). Why is service being changed? We are upgrading the Rosemont station's mezzanine-to-platform escalator to ensure continued safe, convenient service.