FORTH BRIDGE RAILWAY, Machinery for Drilling the Steel Tubes of which the Bridge is to be Constructed. 2. View from the North Shore, Looking South. 3 A Caisson on Launchway, at Low Water, 4. Launch of a Caisson. 5. View from the South Shore, Looking North, engraving 1884, The Forth Bridge is a cantilever railway bridge over the Firth of Forth in the east of Scotland , UK, britain, british, europe, united kingdom, great britain, european.