The department may from time to time require railroad and railway corporations to install and maintain at such places upon the railroad or railway premises as it shall designate such block or other signals or devices as it shall approve for the purpose of safeguarding public travel.
Mass. Gen. Laws ch. 159, § 22
Railway signals required by department
Official source: Massachusetts Legislature. Reproduced from public-domain Massachusetts statutes; confirm against the official source for the current text. Not legal advice.