A railroad corporation shall cause to be placed upon both ends of every freight car owned by it and which it may lawfully use such automatic or other safety coupler as the department, after an examination and test, may prescribe, and the department may annul any such requirement made by it.
Mass. Gen. Laws ch. 160, § 156
Safety couplers on freight cars
Official source: Massachusetts Legislature. Reproduced from public-domain Massachusetts statutes; confirm against the official source for the current text. Not legal advice.