WEAR OF RAILS
- Wear on Head of Rail
- Wear on Ends of Rail
- Wear of Rail on Curve
WEAR ON HEAD OF RAIL
- Wear on head of rail is due to abrasion on moving rails.
- Due to grinding action of sand or dust between the rails and wheels of the train.
- When train starts or applies brakes, the wheel just slides on the rails causing WEAR on the head.
- Load coming on to a track may exceed the carrying capacity of the section. Thus causing the WEAR in the head of rail.
WEAR AT THE ENDS OF THE RAIL
- It is much greater than the WEAR on the head of the rail.
- This type of the wear is resulted due to the blows which the rail receive when the wheel jumps the space between the rail ends.
- The ends are battered by such blows.
- The contact surface between the sleepers and the rail is worn as the as the effect of these blows increased.
- The ballast under the sleepers will loosen due to increase in the intensity of vibrations, also he sleeper will depressed due the displacement of ballast, also the fish plates will get loose under the constant impact of increasing vibrations
WEAR OF RAIL ON CURVE
- On the curve the wear of the rail takes place in both inner and outer rails.
- On the curve the, the outer wheel has to move through greater distance than the inner wheel. And the inner wheel has to slide over the inner rail.
- As a result of this sliding wear of the inner rail occur because the metal in the rail head is burnt.
- At the curve, flange of outer wheel will strike the inner surface of the outer wheel due to centrifugal force. Thus side of the head of rail wears out.