Railway Viaduct of Bermondsey
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Railway lines in south London wound over the docks and each other on long viaducts of brick arches. London Bridge railway station was opened in 1836 as a terminus for the London and Greenwich Railway, and remodeled several times before 1850 to accommodate more railway companies; London and Croydon Railway and London and Brighton Railway to the south, and South Eastern Railway to the north. The London and Croydon Railway and South Eastern Railway constructed a branchline and rival passenger terminal at Bricklayers Arms railway station in 1842 and closed it in 1845. This required a flat junction, on the viaduct, which was controlled by the first ever signal box. The signals and points contained some elements of interlocking.
The first example of a flying junction in the United Kingdom was the Weaver Junction that opened on 13 November 1881. Here the grade separation was used to raise one track over the oncoming mainline on a double junction