MBTA, when referring to the transportation agency in Boston, stands for Massachusetts Bay Transportation Authority. It is sometimes referred to simply as "The T".

NYC had the first subway not Boston.

the T

MTBA stands for Massachusetts Bay Transportation Authority. The MTBA is the Greater Boston's public transportation system. The T Commuter Rail system comprises 11 Lines and over 100 T stations.

"As a Boston resident, I can confidently say that using the T is the best form of public transportation in Boston. If you need to go farther out, you can use the T's commuter rail. There are always taxis available as well."