good example of how supple the rail rail becomes when it's not securely held in place by the ties (sleepers) and ballast. in this case bad drainage has undermined the road-bed allowing water filled voids to form which in turn causes more pumping of the track-bed, if it's not fixed it will lead to a broken rail and renewal of a stretch of the track-bed - expensive..please note, feel free to skip thru, no rails break or trains derail ...sorry!.