over portions of the Lowell and Haverhill lines. Private companies also operate freight service over much of the system (see ). Stations , there are 134 active stations – 53 northside and 81 southside. Six additional stations (, , , , , and ) are indefinitely closed due to service cuts during the COVID-19 pandemic. Three stations (, , and ) are temporarily closed due to structural deterioration. six additional stations are under construction as part of the South Coast Rail project; several other stations are planned. South Station, North Station, and Back Bay all have MBTA subway and Amtrak connections; nine other stations have subway connections, and six others have Amtrak connections. Stations range in size from small platforms like to the sprawling downtown terminals. Most stations outside downtown Boston have one or two side platforms or a single island platform. Standard MBTA platforms are about long – enough for a nine-car train – and a minimum of wide for side platforms and wide for island platforms. 108 active stations are accessible, including all terminals and all stations with rapid transit connections; 26 are not. The MBTA uses -high platforms for accessible level boarding, as is standard in the northeastern United States. Some accessible stations have full-length high platforms for accessible boarding on all cars; others only have "mini-high" platforms about long – which allow for level boarding on two cars – with the rest of the platform length not accessible. , the MBTA is designing a temporary accessible platform that can be added to stations pending full reconstructions. Operations The MBTA Commuter Rail system is operated by Keolis Commuter Services – a subsidiary of French company Keolis – under contract to the MBTA. The MBTA owns all passenger equipment and most stations. Most trackage is also owned by the MBTA. The Massachusetts Department of Transportation (parent agency of the MBTA) owns several portions of the Framingham/Worcester Line as well as the Grand Junction Branch, which is used for non-revenue equipment moves between the northside and southside lines. Pan Am Southern owns the section of the Fitchburg Line between and Wachusett, while Amtrak owns the section of the Northeast Corridor (used by the Providence/Stoughton Line) in Rhode Island. Most lines operate on regular headways, though some have additional service at peak hours. Service levels vary by lines: the Greenbush and Kingston lines have 13 round trips on weekdays, while