In the coasting method, the run- ning resistance is calculated by deceleration while coasting. For example, to obtain the measurement, running tests are conducted about 10 times. The running resistance for each train speed is calculated from the deceleration in each measurement obtained from the coasting runs.
How do you calculate rail resistance?
Train resistance is calculated by multiplying the resistance per ton at each speed, by the total tonnage of the train.
What is the formula to calculate the resistance due to friction in rail?
Internal resistance This resistance is consequential to the movement of the various parts of the locomotive and wagons. R1 = 0.0016W (25.1) where R1 is the frictional resistance independent of speed and W is the weight of the train in tonnes.
What is train resistance?
Train resistance, the force required to move a train, is the sum of the rolling resistance on tangent level track, grade resistance and curve resistance of the locomotives and cars.
What are the 6 types of trains resistance?
The factors that influence train resistance are summarized as the journal-bearing friction, track resistance to rolling, wind resistance, curve and grade resistances, acceleration resistance, and starting resistance. Each of these factors is examined for its magnitude of contribution to total train resistance.
How do you calculate the tractive effort of a train?
For an electric locomotive or a diesel-electric locomotive, starting tractive effort can be calculated from the amount of weight on the driving wheels (which may be less than the total locomotive weight in some cases), combined stall torque of the traction motors, the gear ratio between the traction motors and axles,
What is train shunt resistance?
The highest resistance which, when applied across the track, can open the track relay front contacts is known as its ‘Train Shunt Resistance’ (TSR) value. It is the measure of its dependability. Rfc. Resistance of track lead cable at feed end.
What is hauling capacity of a locomotive?
Hauling power = number of pairs of driving wheels x weight exerted on the driving wheels x coefficient of friction Thus, for a locomotive with three pairs of driving wheels, an axle load of 20 t, and a coefficient of friction equal to 0.2, the hauling power will be equal to 3 x 20 x 0.2 t, i.e., 12 t.
What are the causes of curve resistance in railway?
(c) Curve resistance is caused when a transverse slip occurs, which increases the friction between the wheel flanges and the rails. (d) Poor track maintenance, particularly bad alignment, worn out rails, and improper levels, also increase resistance.
What will be train resistance due to curvature on a BG track for a 4 degree curve with weight of the train as 570 tonns?
It means that for a 4 o curve on a BG line, the curve resistance for a train weighing 250 t would be 0.0004 250 4 = 0.4 t.
Which train resistance is proportional to square of speed?
u=V0cosα.
How do you find resistance from acceleration?
The net external force is equal to the difference between the weight and the drag forces (F = W – D). The acceleration of the object then becomes a = (W – D) / m . The drag force depends on the square of the velocity. So as the body accelerates its velocity (and the drag) will increase.
What does the weight of the rails depends upon?
3. What does the weight of the rails depends upon? Explanation: The weight of a rail per length is an important factor in determining rails strength and hence axle loads and speeds.
Which rail sections are commonly used now a days?
About 90% of the railway track in the world is laid with this form of rails. In India, flat-footed rails are most commonly used.
What is coning of wheel?
Coning of Wheel
The rim or flanges of the wheels are never made flat but they are in the shape of a cone with a slope of about 1 to 20. This is known as coning of wheels. The coning of wheels is manly done to maintain the vehicle in the central position with respect to the track.
What are the different types of sleepers used in Indian Railways explain each in detail?
The sleepers mostly used on Indian Railways are (i) wooden sleepers, (ii) cast iron (CI) sleepers, (ii) steel sleepers, and (iv) concrete sleepers.
How much force does a train exert?
Fully loaded trains are probably in the order of 3000 to 8000 tons, so lets say 5000 tons.
How much force does a train hit with?
First, a force of 2 to 5 pounds per ton of train weight is required to move on straight level track. At very slow yard speeds only 2 to 3 pounds is needed while increasing to about 5 pounds at higher speeds. This force is required to overcome bearing friction, rail deflection, minor flange contact, etc.
How much weight can one train pull?
How Many Tons Can A Modern Locomotive Pull?
| Model | Weight | Total tons on 1% grade |
|---|---|---|
| Light GP40 | 250,000 | 3750 |
| Heavy GP40 | 280,000 | 4200 |
| Light SD40 | 380,000 | 5700 |
| Heavy SD40 | 420,000 | 6300 |
How do railway track circuits work?
Each block has a track circuit which determines whether a train is present. Track circuits work by running a circuit using the rails to connect a power source at one end of the block with a relay at the far end.If the circuit is complete, the relay will be energized, which keeps signals in the “clear” position.
What is re area in railway?
In RE area, generally single rail track circuit is used where one of the rails is reserved for the traction return current.Any connection from the OHE mast or other structure shall be made only to the un-insulated rails.
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