An MBTA “T” Sign Marks a Boston Subway Entrance

Illuminated MBTA transit sign with black "T" logo hanging beneath a Boston building overhang at night.
Illuminated MBTA transit sign with black "T" logo hanging beneath a Boston building overhang at night.

The black "T" inside a circle is the standard symbol of the Massachusetts Bay Transportation Authority, marking entrances to Boston's subway system. The MBTA introduced the roundel in the 1960s, and it has since become a shorthand for the subway itself, with Bostonians commonly referring to the system simply as "the T." The agency operates four subway lines — Red, Orange, Blue, and Green — along with bus, commuter rail, and ferry service across the greater Boston area.

Photo taken in April 2025.

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