Why trains cannot run when tracks are water logged?

Flooding is very dangerous to the permanent way. The earthworks become unstable, ballast can be washed away, and the forces of the water by its movement, buoyancy, and scouring action can seriously weaken and move the track so that it is no longer stable and secure enough to support the weight of a train reliably. read more

Secondly when water loggs in tracks, the grip between the ballast ( stones on the track) and the sleepers are somewhat less, hence there is a fair chance that tracks may be loose and this could be dangerous for a train. hence trains are normally not allowed to run on waterlogged tracks, even if they are allowed its after proper inspection of the tracks. read more