Why concrete sleepers are kept below the railway line?
We know that Concrete or wooden sleepers are kept below the railway line so that the weight of passing trains is spread over a large area of ground and the track may not sink into the ground. Therefore the pressure acting on the ground under the sleepers is reduced.
What are the advantages of concrete sleepers?
Advantages include: They do not rot like timber sleepers, are fire proof, their extra weight makes track more stable (particularly with changes in temperature), they can withstand fire hazards better than wooden sleepers, they give more retentivity to the track, they have a longer life than wooden sleepers, and they …
Why do railway tracks have sleepers?
Railway sleepers, also called railroad ties, railway ties or crossties, are an important railway component. Generally, the rail sleeper is always laying between two rail tracks to keep the correct space of gauge. In the recent time, concrete sleepers are widely used, especially in Europe and Asia.
Why railway tracks are placed on board wooden or concrete wedges?
Railway tracks are laid on large sized wooden sleepers so that the thrust due to the weight of train is spread over large area . This reduces the pressure on the ground which would prevent the yielding of the ground.
Why rails on a railway track are fixed to large wide wooden or steel sleepers?
Explanation: Wooden or concrete sleepers are fixed over a wide region to spread out the load due to the moving train. The wider the area, the less the pressure exerted. In the absence of the sleepers, the rails would sink into the ground due to the heavy load of the moving train.
What plate type has the largest diameter?
The service plate is the largest plate, ranging in size from 11 to 14 inches across.
Why coning of wheels is done?
To keep the train in its central position of the rails, coning does not allow any sidewise movement on a straight track. to allow the wheels to move different distances on a curved track and thereby reduce wear and tear.
Why does bull headed rails have more metal in the head?
Why does Bull headed rails have more metal in the head? Clarification: Huge amount of load on the rail causes damage to it. For better endurance and longer life the Bull headed rails have more metal in the head.
Why are flat footed rails preferred over bull headed rails?
Flat footed rails has the following advantages They are much stiffer both vertically and laterally. The lateral stiffness is important for curves. They are less liable to develop kinks and maintain a more regular top surface than bull headed rails. They are cheaper than bull headed rails.
What is difference between rail and train?
Key Difference: A rail is a set of two parallel rows of long pieces of steel or iron. A train is a mode of transportation that runs on these laid tracks of rails and is generally used for long distances; a train usually runs outside city limits.
What are subway trains called?
Rapid transit or mass rapid transit (MRT), also known as heavy rail, metro, subway, tube, U-Bahn, T-Bane, metropolitana or underground, is a type of high-capacity public transport generally found in urban areas.
Why is it called a subway train?
In America the first metro was built in New York, and it was called SUBWAY because it was built mostly under the streets (sub= under / way= road), since Manhattan street plan is quite a regular grill and it was easy to do so. …