Question

Why are railway tracks laid on a large sized concrete sleepers?

Answer 1

Larger is the surface area of a body, lesser is the pressure it exerts on the ground. As the sleepers increase the area of contact of rail many a times, this reduces the pressure on the surface of ground by the train.

Answer 2

railway tracks laid on a large sized sleepers because train is of heavy weight and when it comes on tracks it forces the rails downwards and as a result if there is no sleepers it breaks the iron rails , due to sleepers the force applying on the rail downwards get destributed on each and every sleeper and rail don't breaks and it reduces the chances of accident.