Railway bridge or Sheppards street underpass was built of stone between 1840-41 by the Great Western Railway to carry the main line between Bristol and Paddington.
The bridge originally had a width of 49 feet, then in 1872 to accommodate more railway lines it was widened to 146 feet using brick and steel and then widened again in 1899 to 351 feet.
The last widening involved the demolition of a small arch bridge to the north called Crown or Woodham's bridge.
Today the canal line is a footpath and cycle track.
