Around 2000, portable lifts were added at Lechmere as a temporary accessibility measure, along with a wooden mini-high platform on the inbound side. (Unlike other stations, Lechmere was not soon retrofitted with raised platforms due to the pending Green Line Extension.) On June 25, 2004, service to Lechmere was suspended as the Causeway Street Elevated was removed, and the surface and elevated platforms at North Station were consolidated into a new underground "superstation". A shuttle bus to Government Center accommodated Lechmere passengers. Service to Lechmere, operated only by the E branch, resumed on November 12, 2005. Service past North Station was replaced with buses from April 30 to November 4, 2011, as Science Park station was rebuilt.