became a busy commuter line, but service declined after World War I, and again after World War II. On April 18, 1958, the Public Utilities Commission approved a vast set of cuts to Boston and Maine Railroad commuter service, including all stations on the Western Route south of (except for Malden). The stations were closed on May 18, 1958, amid the first of a series of cuts. The Oak Grove station building was reused as an antique store by 1962, and was later demolished. MBTA station Oak Grove opened on March 20, 1977, as the northern terminus of the Haymarket North Extension of the Orange Line. The design of Oak Grove station was based on that of , opened in 1971. The extension was originally intended to run to , but was cut back to Oak Grove. A platform (sized for Orange Line trains rather than longer commuter rail trains) was built to serve the single Western Route commuter rail track, for potential use should the remainder of the extension be built. In the fare mezzanine, a sign labels the platform as "Orange Line outbound". Malden Center served as a stop for commuter rail trains from 1977 to 1979, while Oak Grove did not. After the approach trestles at North Station burned on January 20, 1984, Oak Grove became the inbound terminus for the Haverhill Line. When North Station reopened on April 20, 1985, Malden Center replaced Oak Grove as the Malden commuter rail stop. 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, Oak Grove occasionally served as a temporary inbound terminus for Haverhill Line service during commuter rail service disruptions between Oak Grove and Boston's North Station. (Double track begins just north of the station, making operations easier than using Malden Center as the terminal.) It served this role during the 2004 Democratic National Convention, when North Station was closed for a week for security purposes. In October 1997, Oak Grove was identified as a possible site for a parking garage, but this was never pursued. Renovations During 2013, the MBTA performed heavy maintenance on the Orange Line platform, which had substantially deteriorated during 36 years of operation. High-pressure water was used to strip away the top layer of concrete; a smoother top coat and