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How about this ?
Docklands light railway, 1 in 17 (5.88 %) at the entrance to the tunnel from the original London and Blackwall railway viaduct to the tunnel to Bank.
On the "proper" railway it's probably the Lickey incline.The climb is a gradient of 1-in-37.7 (2.65%) for a continuous distance of two miles (3.2 km).
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Philip.
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