Royal Border Bridge spans the River Tweed between Berwick-upon-Tweed and Tweedmouth in Northumberland, England. It is a Grade I listed railway viaduct 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.