The trolley smashed into the back of another trolley, injuring 49 people.
The Massachusetts Bay Transportation Authority on Saturday announced it was banning train operators and bus drivers from carrying cell phones on board.
Currently, LIRR engineers, who operate the trains, can carry personal cell phones while on duty. But they must be shut off and stowed in a bag.
The engineers can use them only during emergencies.
LIRR officials haven't said when they will decide whether to ban employees' cell phones.
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