British Rail Class 201, Hastings Diesel-Electric Multiple Unit (DEMU). (Gosh Ness Monster) on tour, known as a 'thumper', going over the Royal Border Bridge in Berwick-upon-Tweed. The 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,