English: Geographic map of the MBTA Commuter Rail system and the MBTA funding district. The original 14-town MTA district is shown in darkest pink, the 78-town MBTA district established in 1964 in medium pink, and the 175-town "forward funding" district established in 1999 as light pink. White areas are not part of the MBTA district but still pay state sales taxes which are partially used to fund the MBTA. Rhode Island, which is not part of the district but pays for service to 3 stations under the 1988 Pilgrim Partnership, is shown in light blue.
The CTrail Hartford and Shoreline East systems are shown in red, with the state in purple and Springfield and Longmeadow, Massachusetts shown in a lighter shade of purple to indicate service. Unlike the MBTA's forward funding model, CTrail has Federal and state funding, without municipality districts at this time.