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Royal Border Bridge spans the River Tweed between Berwick-upon-Tweed and Tweedmouth. It is a Grade I listed railway viaduct Link built between 1847 and 1850, when it was opened by Queen Victoria. The engineer who designed it was Robert Stephenson (son of George Stephenson). It was built for the York, Newcastle and Berwick Railway and is still in regular use today, as part of the East Coast Main Line.
The bridge is 659 metres long. It has 28 arches, constructed of brick but faced with stone.

Grade I listed buildings and structures are of exceptional, even international importance. There are over 6,000 in the country. Only 2.5% of listed buildings are Grade I listed.
In Scotland the classification is Category A
Index: Link

The East Coast Main Line is a 393 mile long high speed electrified railway between London and Edinburgh, via Peterborough, Doncaster, York and Newcastle. It was constructed between 1846 & 1871 by several different rail companies.
Wikipedia: Link