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The Brighton Main Line opened in 1841. It operates between London (London Bridge and Victoria) and Brighton, it is 50 miles long. Today it is a very busy line as it includes trains to Gatwick Airport.
Wikipedia: Link

Built in 1841, the Ouse Valley Viaduct (also called Balcombe Viaduct) over the River Ouse on the London-Brighton Railway Line north of Haywards Heath and south of Balcombe is 1,475 feet long.
The viaduct is 96 feet high and is carried on 37 semi-circular arches, each of 30 feet, surmounted by balustrades. Each pier contains a Jack arch with a semi-circular soffit to reduce the number of bricks required. At each end of the abutment is an ornamental square open tower, the brickwork of which is faced with stone from Heddon Quarries near Newcastle-upon-Tyne. The viaduct was designed by engineer for the line John Urpeth Rastrick in association with the architect of the London to Brighton railway, David Mocatta.