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What is Creep of Rails? Causes of Creep of Rails – Railway Engineering

Posted on 26th October 201822nd February 2022 By Malay Sautya

Contents

  • 1 Creep of Rails
    • 1.1 Causes of Creep
      • 1.1.1 1. Wave Theory
      • 1.1.2 2. Percussion Theory
      • 1.1.3 3. Drag Theory
      • 1.1.4 4. Nature of Movement
      • 1.1.5 5. Change in Temperature
      • 1.1.6 6. Direction of Traffic

Creep of Rails

Creep of rails is defined as the longitudinal movement of rails with respect to sleepers in a track. Creep is common to all railway tracks but varies in magnitude considerably from place to place and from time to time. It is observed that the creep occurs in the direction of dominant traffic.

Creep of Rails - causes of creep
Creep of Rails

Causes of Creep

The following are the principal causes of creep in rails.

1. Wave Theory

According to this theory, wave motion is set up in a resilient track by moving loads of wheel which is the chief cause of creep. 

2. Percussion Theory

This theory states that the creep in rail is due to the impact of wheels at the end of the rail ahead at joints.

3. Drag Theory

This theory states that the backward thrust on the driving wheel pushes the rail in the backward direction(drag effect), while the other wheels push the rail in the direction of travel and they gave greater effects as compared to drag effect. This results in creep of rail in the direction of movement of trains.

4. Nature of Movement

The amount and direction creep depends upon starting, accelerating, slowing down, or stopping of the train.

5. Change in Temperature

Creep also occurs due to the variation in temperature.

6. Direction of Traffic

Heavy traffic in one direction will cause creep.

In addition to the above main causes, the following minor causes are also responsible for the development of creep in rails.

1. Creep depends upon the alignment of the track, It is more on curves than on a straight railway track.

2. It also depends upon the grade of the track, type, and age of rails.

3. Poor maintenance of track components and ill-design of superelevation, curves, joints, etc. will also maybe increase the creep.

Read more:

Hogged, Buckling, And Tilting of Rails

Prevention of Creep of Rails

Effects of Creep of Rails

Railway Engineering

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