Just south of Earlston in the Scottish Borders, three bridges span the River Tweed. A modern road bridge constructed in 1973 to carry the A68 over the river. The Drygrange Bridge built in 1780, now closed to vehicles but accessible to cyclists and walkers and the Leaderfoot Railway Viaduct constructed in the 1840s but closed since 1948. It’s believed that the Romans build a bridge here but all remains have disappeared. Trimontium, the remains of a Roman fort lies a short walk uphill from the bridges.
There are also 3 bridges in close proximity spanning the River Tweed in my hometown of Berwick upon Tweed in North Northumberland but in a slightly different sequence. Fortunately the Royal Tweed road bridge (the 2nd bridge the photo below) is more attractive than the A68 road bridge. The old bridge in Berwick is now only open to southbound vehicles. Even so I’d prefer if it was pedestrianised as it can be rather daunting as cars whizz past you when you’re walking on the narrow pavement. The Royal Border railway bridge in Berwick is part of the East Coast main railway line.
You can read about all the bridges over the Tweed here.