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Identify the correct statement(s) associated with providing super elevation on railway curves. S1. Cant Excess : Occurs when the train travels around a curve at a speed higher than the equilibrium speed. S2. Cant Deficiency : Difference between the actual cant provided and the theoretical cant required at low speeds. S3. Maximum permissible speed: Highest speed permitted to a train on a curve taking into consideration the radius of Curvature, actual cant, cant deficiency, cant excess, and the length of transition.

Identify the correct statement(s) associated with providing super elevation on railway curves. S1. Cant Excess : Occurs when the train travels around a curve at a speed higher than the equilibrium speed. S2. Cant Deficiency : Difference between the actual cant provided and the theoretical cant required at low speeds. S3. Maximum permissible speed: Highest speed permitted to a train on a curve taking into consideration the radius of Curvature, actual cant, cant deficiency, cant excess, and the length of transition. Correct Answer S3 only

Concepts:

S1- False

The superelevation provided on railway curves in order to counter the centrifugal forces on the basis of the actual speed of the train is called Cant. But on rails, different trains have different speeds of travel so when the train travels around a curve at a speed slower than the equilibrium speed is called cant excess.

The maximum allowable cant excess is

For BG – 75 mm

For MG- 50 mm

For NG- 40 mm

S2: False

The actual cant provided on a railway track is based on the average speed of trains. However, in the case of high-speed trains, the cant requirement will be more than the actual value of cant provided so that train will be forced to move on a lower value of cant the maximum cant is required for the high-speed train. This deficiency in cants for high-speed trains i.e. difference between the actual cant provided and the theoretical cant required for higher speeds is called a cant deficiency.

The maximum permissible limit of cant deficiency is given below in tabulated form different types of railway gauges:

  Type of Gauge

Cant Deficiency in ‘cm’

Speed ≤ 100 km/hr

Speed > 100 km/hr

BG

7.6

10.0

MG

5.1

-

NG

3.8

-

 

S3: True

The maximum permissible speed is the maximum of the following:

  1. The highest speed permitted to a train on a curve taking into consideration the radius of Curvature, actual cant, cant deficiency, cant excess.
  2. Based on the length of the transition
  3. Based on the formulas provided by the Railway board
  4. Based on Martin’s formula

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