of taxicab drives in the name of security. Passenger traffic has increased and is exceeding the design capacity of the 1991 renovation. On May 1, 2002, the station was designated a Chicago Landmark, protecting its exterior, rooflines, and public interior spaces from alterations. The status protects all exteriors, rooflines, the central lightwell, vehicular drives, the Great Hall, skylight, and select interior features – balconies, porticos, corridors, lobbies, and stairs. In 2010, Amtrak (the current owners of the Chicago Union Station Company) announced plans to air-condition the Great Hall for the first time since the 1960s. That year a Chicago Tribune investigation revealed high levels of diesel soot on the underground platforms of Union Station. Metra established an "Emissions Task Force" to study this problem and recommend solutions to improve air quality in the underground areas. In 2011, its lighting system was replaced with more energy-efficient light bulbs and motion sensors, reducing the station's annual carbon emissions by 4 million tons. Custom steel lighting covers were added to top these safety/light towers, helping them blend in with the overall neoclassical style of the station. In 2011, the city held a public meeting to discuss goals for the station, aiming to accommodate the expected 40 percent growth in passengers by 2040. In the following year, city agencies joined together to publish a master plan for renovating and improving Union Station. Short-term goals were to improve station entrances and expand waiting rooms, as well as enhance bus lanes on Clinton and Canal Streets and create a bus terminal (completed in 2016). Goals for the next five to ten years included widening commuter platforms, using unutilized mail platforms (including an extra-long through platform) for intercity passenger trains, adding more through tracks and platforms, reorganizing facilities for better capacity and flow, increasing height clearances of the tracks, and improving street access to and from the station. Long-term, proposals include increasing capacity and improving the ambiance of the station by significantly expanding or replacing station facilities in the 200 or 300 blocks of South Canal Street. Adding track and platform capacity along Clinton Street or Canal Street was also analyzed. In June 2015, Amtrak announced that it would renovate the station, including opening up long-closed spaces and replacing the worn staircases with marble from the original quarry near Rome. In 2016, the women's lounge was restored, renamed the Burlington Room, and opened for use as an