For more than 100 years it has helped train passengers reach Lowestoft and Norwich by swinging into action over the River Waveney.
Somerleyton swing bridge was built in 1905 to carry the double-tracked Norwich to Lowestoft line over the river, replacing a previous single-tracked bridge.
Operated by Network Rail, it still opens to allow river traffic several times a day using much of its original mechanical equipment - and every now and then is known to get stuck in position due to faults.
And now people are being offered a rare opportunity to tour the Edwardian bridge and its control tower.
Guided tours of the bridge will take place on Saturday, September 9 and Saturday, September 16 as part of the Lowestoft Heritage Open Days Festival.
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The Wherry Lines Community Rail Partnership and the Lowestoft Central Project are organising the tours in collaboration with Network Rail.
Network Rail Anglia operations manager, Ian Martin, said: “Somerleyton swing bridge is a marvel of Edwardian engineering which is usually out of bounds to the general public.
"As part of the Heritage Open Days Festival and through our great relationship with the Community Rail Partnership, it is a pleasure to give people the chance to see the original equipment first-hand.”
Apply for tickets by emailing lowestoftcentral@gmail.com or you can purchase them at the Community Rail Shop and Tourist Information Office at Lowestoft railway station.
With its remote location within the marshes, those attending tours must be able to walk approximately one mile on uneven ground and be able to climb several steps. Those applying for tickets will be allocated a time slot and meeting point where they will be escorted to and from the bridge.
The swing bridge is one of three on the Wherry Line, the others being at Reedham and Oulton Broad.
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