A regular and rigorous system of inspection of railway bridges is followed on Indian Railways. Under this system all the railway bridges are thoroughly inspected once a year by designated officials. In addition, the inspecting officials also inspect the bridges during their routine inspections. Rebuilding/Rehabilitation/Strengthening of bridges is undertaken on the basis of their physical condition as ascertained during regular inspections. During the last five financial years, a total number of 6011 Rail Bridges have been rebuilt/rehabilitated/strengthened in Indian Railway system.
This information was given by the Minister of State for Railways Shri Adhir Ranjan Chowdhury in written reply to a question in Lok Sabha .
Source - PIB