Mass. Gen. Laws ch. 89, § 6A: Stopping of street railway cars for passage of fire apparatus

Section 6A. Every motorman of a car upon a street railway shall, upon the approach of any fire apparatus going to a fire or responding to an alarm, immediately stop said car and keep the same at a standstill until such apparatus has passed. Violation of any provision of this section shall be punished by a fine of not more than twenty-five dollars.