220 CMR, § 151.13
An Operator is prohibited from using or having in his or her possession an Electronic Device while the Operator is on duty and on his or her train, which includes streetcars. The Electronic Device cannot be anywhere on the Operator's person or property, such as pocketbook or other belongings. The Electronic Device cannot be on the vehicle he or she is operating or in any part of a train consist. The Operator cannot give the Electronic Device to another person on the train or streetcar to hold, whether or not that person is a Transportation Authority employee. The Operator is prohibited from any use of any Electronic Device while on duty including, but not limited to, telephoning, checking the time, texting, playing games, reading, e-mailing, or listening to music.
220 CMR, § 151.13