The Reversing Falls Railway Bridge is the name given to two different steel truss bridges crossing the Saint John River at the same location in Saint John, New Brunswick, Canada. The original bridge was constructed in 1885 immediately upstream of a highway crossing known as the Reversing Falls Bridge. Measuring 372 metres (1,220 ft) in length, the railway bridge carried a single-track main line. A replacement structure keeping much of the same design was opened in 1922 to accommodate heavier loads; the original being demolished in 1921.