Two technical drawings rendered in sepia tones depict railroad crossing mechanisms from a 1936 patent, with the left figure showing the iconic crossbuck sign and bell apparatus, and the right showing the articulated signal arm in raised position. The composition balances engineering precision with historical weight, rendered in fine linework against an aged paper ground that evokes the original patent document's weathered authenticity. At home in an office, study, or transit enthusiast's collection. Printed on soft, lightweight polyester with hand-sewn edges and made to order. Original artwork at room scale, light enough to hang almost anywhere and move with you.