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Automatic Twist Locks.

Rail Pads

Insulation System

Brake Parts

Bogie Components




Rail Pads

:: Product Details

:: Customer Base

:: Tests & Certificates


The Primary function of the rail pad traditionally has been that of a conforming resilient member between the as-rolled surface of the rail, and the as-cast surface of the rail seat of the concrete sleeper. It also provides an electric insulation between these two surfaces.

However in today's environment where the axle loads and speeds are being increased to 32.5 tons and 180 km/hr. respectively on Indian Railways, other requirements have gained importance and dynamic performance of the rail pads have become the main criteria of design, development and selection / adoption.

The rail pads are developed in collaboration with leading company of Australia to have High resilience, impact attenuating, wear and tear resistant properties. Our Australian partner is a specialized rubber product development company, who are world leaders in design and development of rubber isolators / energy absorbers for railways and construction industry. The rail pads has been extensively tested and adopted by Australian Rail Track Corporation for high axle load, heavy haul freight train tracks. 

1. The key design feature of our rail pad is - Multi Spring configuration. This configuration provides three groups of secant compression springs rates as follows:

1st is a low rate to provide adequate deformation induced by low load (Wagon at tare).

2nd is a higher rate designed for the normal maximum axle loads of 35 tons, again to provide deformation to minimize shock loads.

3rd rate which is the main advantage of our pads is the ability to prevent excessive creep when substantial overload conditions are maintained for extended periods of time, e.g. train parked or stopped for extended periods, with uneven axle loads.

To obtain this high load resistance capacity we have adopted a system where in addition to an otherwise flat pad, 4mm thick, projection top and bottom formed in a geometric shape have been added. These projections are integrally linked together by a way of modulated ridges. Aside from all previously listed benefits this design is self cleaning with assistance of wind and rain.



The key superior feature of this rail pad is:-

1.   Reduces vibration and impact transmission from rail to sleeper by providing resilience and impact attenuation.

2.   Give adequate resistance to longitudinal and rotational movement of rail.

3.   Ensures long life- Minimum 10 years.

4.   Properties are stable over a wide range of operating temperatures during life.

5.   It does not deform, abrade or move out of fastening system under dynamic loads.

6.   It is not adversely affected by ozone, ultra violet light , oils and related chemicals.

7.   Reduces possibility of rail foot corrosion and concrete sleeper erosion

8.   Provides more resistance to longitudinal rail movement due to creep or thermal expansion.

9.    Provides electrical résistance between rail and sleeper

10.  Provides conforming layer between rail and sleeper to avoid contact areas of high pressure.


The design , material of the pad and vulcanizing process need to be given due consideration so as to obtain the fine balance between resilience and damping , creep properties and fatigue life of the rubber. The above mentioned salient advantages are obtained by adopting a multi pronged approach as briefly given below:-

a)      Optimized shape factor: The ratio of loaded area to the force free area has been optimized after computer simulations,

b)      Right ingredients: natural rubber RMA 1X which is completely free from dust, particles of bark of rubber trees etc. is used instead of RMA IV specified in IR specification along with synthetic rubber.

c)      Right Vulcanizing agent. : Our vulcanizing agent does not leave any free sulphur practically after vulcanizing, which in other cases continues the vulcanization process in service and results in premature ageing.

d)      Anti-degradants: A mix of anti oxidant, anti ozonants , anti flex resistant chemicals are used. This is in addition to protective agents against heat.

e)      Fillers: Only reinforcing fillers are used.

f)        Coupling Agent: These chemicals assure a chemical bond between rubber and the reinforcing filler instead of physical bond.

g)   Optimum vulcanizing Process : the rate of heating and cooling during the process of vulcanization play an important role in obtaining the final product. These have been properly designed and followed to obtain the improved rail pad.



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