Boston is known for its subway system, the "T", one of the oldest in the U.S.

The "T" system, sometimes known as Boston's subway system, is an essential component of the city's public transit system. The T is one of the oldest subway systems in the US, having been founded in 1897. Easy access to Boston's downtown and neighboring areas is made possible by the system's commuter rail, bus, and subway lines. The T provides a dependable and environmentally responsible substitute for driving, serving hundreds of thousands of commuters every day. The T, which connects locals and visitors to important locations across the city, is still a recognizable and vital part of Boston's transportation system because of its effectiveness and historic elegance.