elevated railroad structure that was planned, and prevented the extension. The 1975 extension was built along the existing Western Route embankment rather than Main Street. The former station platform closed simultaneously with the opening of the Orange Line station. A high-level platform - the first on the MBTA system - was installed along the Reading Line track, but Reading Line trains did not stop. The platform opened for regular service on May 1, 1977, but closed again on September 1, 1979. On January 20, 1984, a fire destroyed the approach trestle to the Charles River Bridge at North Station; Haverhill Line trains were run to . North Station reopened on April 20, 1985; the commuter platform at Oak Grove closed but the platform at Malden was reopened. The switch may have been made due to a request by John A. Brennan Jr., who was then constructing a large development near Malden Center station. Because of its Orange Line connection, Malden Center can serve as a temporary inbound terminus for the Haverhill Line when commuter rail service is disrupted between Malden and Boston's North Station. It served this role in 2016 during reconstruction work on the Woods Memorial Bridge, which carries the Revere Beach Parkway over the rail lines and the Malden River. Oak Grove station is usually used during weekday disruptions, as it is closer to the double-track section of the line in Melrose. Renovations Unlike most MBTA stations, air rights over the station are owned by the city rather than by the MBTA. By 1983, the city planned to built a footbridge to connect the station to nearby developments. In 1989, the MBTA studied a possible accessible footbridge at the station, which would have cost $2.8 million and opened in 1991. The station was not initially accessible, but it was built with provisions for a future elevator. The MBTA began a renovation of the station, then estimated to cost $6 million, in 2003. It was originally to be completed in 2003, but was substantially delayed by changes to building codes. Completed in 2005, the ultimately-$10 million project added a second exit stairwell and two elevators, making the station accessible. In 2002, as part of its public art program, the MBTA added panels with artworks by local schoolchildren at and Malden Center. The station also has two benches in the lobby painted by local arts students. Changes to wayfinding signage,