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Boston and Maine railroad shops at Billerica, Massachusetts. Welder using special flame to melt only head of rivet so it can be removed without burning other metal of car. Sourced from the Library of Congress.

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Boston and Maine railroad shops at Billerica, Massachusetts. Welder using special flame to melt only head of rivet so it can be removed without burning other metal of car. Sourced from the Library of Congress.

More