successor to the BTC - began work at Maverick Square to convert the East Boston Tunnel to high-floor metro trains. The next year, the BTD board approved the construction of high-level platforms at Atlantic Avenue, Devonshire, Scollay Under, and Bowdoin. Construction of concrete high-level platforms above the rails at Devonshire began in December 1923 or January 1924. A section of low-level platform was left to serve streetcars during construction. The station was also extended by to accommodate the new trains, with work completed on March 1, 1924. Over the weekend of April 18–21, 1924, the East Boston Tunnel was converted to high-floor metro stock. Temporary wooden platform sections were put in place to allow service to begin on April 21, with the permanent concrete sections completed by July 12. The edges of the original low platforms can still be seen under the high platforms. On March 31, 1937, the BERy opened an entrance from the Exchange Building lobby to the eastbound platform. The entrance was closed around 1981 as the building was modified for construction of Exchange Place. Washington Street Tunnel The Washington Street Tunnel opened on November 30, 1908 to Main Line elevated trains running between Forest Hills and Sullivan Square. As with the other stations in the tunnel; the two platforms were treated as completely separate stations. The northbound platform was known as State since its main entrance was at the cross street of State Street, while the southbound platform was similarly Milk Street after its entrance from Milk Street. (The station pair was designated on some maps as Milk/State). MBTA era After taking over operations in 1964, the Massachusetts Bay Transportation Authority (MBTA) began rebranding efforts. The East Boston Tunnel/Revere Extension and Main Line El/Washington Street Tunnel routes were renamed as the Blue Line and Orange Line on August 25, 1965. On January 25, 1967, the separate station names of Devonshire and Milk/State were changed to State. In 1971, the MBTA and Institute of Contemporary Art, Boston held a competition called "Design in Transit", with the winning work to be placed in the passageway to the southbound Orange Line platform. It attracted over 300 entries, many of which were criticized for being inappropriate for the setting: "spooky shadow play" that would scare riders already in a nervous atmosphere, and audio works that would add to the cacophony of the busy station. The winning work by Robert V.