No railroad corporation or railway company or any officer or employee thereof shall use or deposit a torpedo or other explosive upon or near the tracks of any railroad or railway for the purpose of signaling or otherwise, unless there is plainly and conspicuously stamped or otherwise permanently marked thereon in a manner approved by the department a word or words indicating that such torpedo or other explosive is dangerous.
Mass. Gen. Laws ch. 159, § 102
Designation of torpedoes or other explosives
Official source: Massachusetts Legislature. Reproduced from public-domain Massachusetts statutes; confirm against the official source for the current text. Not legal advice.