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In page Massachusetts Bay Transportation Authority:

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The MBTA purchased bus routes in the outer suburbs to the north and south from the Eastern Massachusetts Street Railway in 1968.[5] As with the commuter rail system, many of the outlying routes were dropped shortly before or after the takeover due to low ridership and high operating costs. The MBTA started subsidizing the Middlesex and Boston Street Railway in 1964, and acquired it in 1972, creating its 5xx bus routes.[citation needed]