The Forth Bridge is the Scottish railway bridge completed in 1890 that crosses the Firth of Forth near Edinburgh.
The cantilever bridge links South Queensferry in West Lothian with North Queensferry in Fife. Its enormous red steel structure was designed by engineers Benjamin Baker and John Fowler and became one of the defining engineering achievements of the Victorian era. The railway crossing remains in use today.
The Forth Bridge is often confused with two later road crossings beside it. The Forth Road Bridge opened in 1964, while the Queensferry Crossing opened in 2017. The railway bridge was added to the UNESCO World Heritage List in 2015, which recognized its technological importance and highly visible industrial design. Its famous red paint has also contributed to the expression about painting the Forth Bridge, though modern maintenance uses more durable systems than the traditional repeated repainting suggested by that phrase.