Incredible Photographs From The Construction Of The Forth Railway Bridge, A 19th Century Engineering Marvel

Spanning 541 meters over the Firth of Forth, Edinburgh’s Forth Railway Bridge became the longest cantilever bridge in the world when the future King Edward VII drove its final “golden” rivet on March 4, 1890. Its length was surpassed a few decades later by the Quebec Bridge in Canada, completed in 1919, but the Forth Bridge still holds second place, and remains an incredible feat of engineering.

h/t: flashbak

The bridge was fully restored in 2012, designated a UNESCO World Heritage Site in 2015, and voted Scotland’s greatest man-made wonder the following year.

“Its distinctive industrial aesthetic is the result of a forthright and unadorned display of its structural components,” writes UNESCO. “Innovative in style, materials and scale, the Forth Bridge marks an important milestone in bridge design and construction during the period when railways came to dominate long-distance land travel.”

Work on the bridge’s materials started in 1882. Workers began laying foundations in 1883, a dangerous, three-year process that involved sinking wrought iron caissons into the seabed in order to build the granite piers that would support the superstructure.

“The idea to create a permanent rail crossing over the Forth estuary came about in the 1870s,” notes The Scotsman, “when engineer Thomas Bouch was enlisted to design a railway suspension bridge to replace the Granton train ferry.”

The project would be financed by a consortium of railroad owners. But before Bouch could begin, the Tay Bridge, which he had designed, collapsed in 1879, killing over 70 people. He was replaced by English engineers John Fowler and Benjamin Baker, who proposed the cantilever design as the best means of withstanding gale force winds and heavy freight trains.

Built 150 feet above the water to allow large ships to pass beneath, the Forth Bridge “required ten times the amount of metal as the Eiffel Tower in Paris.” Upon completion, the bridge represented the largest-scale steel building project in Britain, using 55,000 tons of steel. Like so many infrastructure projects of the time, the scope of the Forth Bridge construction seems staggering in hindsight, given the lack of modern machinery and safety equipment.

These photos date from between 1886 and 1890.

The Forth Bridge, now called the Forth Railway Bridge to distinguish it from the roadway constructed later, would acquire an iconic bright red paint job that has seemed to need constant repainting since its opening, giving rise to the locution “like painting the Forth.”

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