A substantial and gently curving masonry viaduct that once carried the Penicuik Railway across the River North Esk in Midlothian, the Firth Viaduct or Old Woodhouselee Viaduct lies immediately to the east of the Woodhouselee Tunnel, immediately to the to the north of Old Woodhouselee Castle and a quarter-mile (0.4 km) southeast of Auchendinny. Opened with the line in 1872, this ten-arch bridge fell from use in 1967. It reaches a height of 20.1m (66 feet) above the river and each span extends to 10.7m (35 feet), giving a total length of 107m (350 feet). A low stone parapet runs along on both sides of the deck, protected by a modern steel barrier, although some of the original iron handrails remain extant. The viaduct was Category-B listed in 1971 and now forms part of the Penicuik-Dalkeith Walkway.
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