The Murrumbidgee River railway bridge is a heritage-listed railway bridge across the Murrumbidgee River located on the Tumut railway line at Gundagai in the Cootamundra-Gundagai Regional Council local government area of New South Wales, Australia. It was built in 1903. It is also known as the Gundagai Rail Bridge over Murrumbidgee River and the Murrumbidgee River Railway Bridge. The property was added to the New South Wales State Heritage Register on 2 April 1999.

The Tumut and Kunama railway lines are disused railway lines in the south of New South Wales, Australia. The Tumut line was a 104 kilometres (65 mi) long branch of the Main South line, branching southwards from it at Cootamundra and heading to the town of Tumut. The line served the towns of Tumut and Gundagai, where the line crosses the Murrumbidgee River with a large iron girder bridge and wooden viaduct. Villages on the line included Brawlin, Muttama, Coolac and Tumblong.