The Providence/Stoughton Line is a line of the MBTA Commuter Rail system running southwest from Boston, Massachusetts, USA. The main line was originally built by the Boston and Providence Rail Road, and now carries service between Boston and Wickford Junction in North Kingstown, Rhode Island. The Stoughton Branch, built as the Stoughton Branch Railroad, splits at Canton Junction and runs for two more stations to Stoughton Station in the town of the same name. An extension of the Providence section of the line to T. F. Green Airport and Wickford Junction opened in stages in 2010 and 2012, making the Providence/Stoughton Line the longest of the MBTA's commuter rail lines (surpassing the Fitchburg Line), while an extension of the Stoughton Branch to New Bedford and Fall River is under construction.