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“Laughin” and “Greetin” refer to the laughing and crying faces on the keystones on each side of the bridge. On the west side (above) the greetin (crying) face represents the contractor building the difficult route with Falkirk Tunnel and eleven locks which bankrupt him. On the east side (below) the laughin (laughing) face shows the contractor building the much easier route to the east who made a healthy profit.