included a new tunnel and an underground North Station. The Causeway Street terminal was closed on March 28, 1997 for construction of a new Green Line tunnel. The tracks to the Causeway Street elevated were shifted east onto the 1975-abandoned part of the incline, and a temporary elevated structure was built over Haverhill Street. Service over this structure ended on June 25, 2004; service to the new underground North Station "superstation" began on June 28. A new incline at Martha Road some to the northwest, which connects the extended tunnel to the Lechmere Viaduct, opened on November 12, 2005. The former Canal Street incline site was soon covered by commercial development. References External links Green Line (MBTA) Orange Line (MBTA) Railway inclines in the United States