… by Mufaddal Najmuddin Deesawala, Chairman & Managing Director of Ameenji Rubber
India’s railway system is being modernised rapidly, with greater spending on high-capacity lines, heavy rail systems, new bridges, elevated tracks, and new railway technology. Most references to this modernisation have to do with trains, rails and engineering structures. However, the reliability of these devices involves many special elements that vanish after being installed in the right place. Among them is machinery made of rubber that enables a railway system to adjust movements, absorb shocks and withstand vibrations for millions of cycles.
The significance of these components becomes particularly obvious when we observe the situation in the Indian railway system and witness the enhancement of the frequency of trains, mass of cargoes and speed of operation.
Rubber Elements That Enhance Railway Performance
Railway infrastructure operates under a different load regime. In contrast to static structures, railway systems operate under cyclic and localised loads, which also include high-frequency impacts through the rail seat. The energy must be dissipated before it spreads into the ballast, sleeper, and the track formation underneath.
Grooved rubber sole plates and composite grooved rubber sole plates are employed to carry out different functions at this junction. Located between the rail and the sleeper, they help in load distribution from the wheels, impact absorption, vibration damping, surface protection from wear, and electrical insulation. Electrical insulation is significant as it can affect the performance of track circuits and signalling systems.
Rubberised level crossing panels also play an essential role at the intersection of road and rail transport systems. They ensure that road vehicles have a reliable surface to drive over while maintaining an adequate flangeway clearance for train wheels. This exemplifies how small parts can be important both in terms of safety and reliability.
Rail transport systems also depend on anti-vibration solutions and special rubber parts in cases where vibration suppression is required. Vibration doesn’t cause any immediate visible damage, but its cumulative effects can reduce fatigue life, weaken connectors and hasten deterioration of neighbouring structures.
The Role of Rubber in Engineering – Movement, Durability and Safety
Rubber plays a vital part in infrastructure due to the characteristics of elastomers, which can deform under pressure and return to their initial position. This enables rubber parts to produce controlled deformations under the effect of pressure.
The same concept applies to bridge bearings which are used in railway bridges and elevated constructions. Bearings help to transmit the loads of the structure and, at the same time, enable controlled rotation and displacement due to temperature changes, live loads and other movements.
Rubber parts may only play a minor role in a railway system, but they are very important for the control of impact, vibrations, movements, and forces. As the railway infrastructure becomes faster and stronger, the importance of moving from designing stronger systems to systems that can cope with continuous motion and function over their lifetime grows. Here is where material science, precision manufacturing, and rigorous testing come in, according to Mufaddal Deesawala Ameenji, Chairman & Managing Director, Ameenji Rubber Limited.
Nevertheless, the importance of material and manufacturing quality is also crucial for achieving performance. Rubber parts have to deal with specific combinations of mechanical stress, temperature, humidity, weather impact, and repeated loading which should be taken into account during specification.
In railway applications, meeting RDSO standards, testing of materials, measuring sizes and establishing traceability of production aspects is paramount to repeating performance. The aim is not only to produce a rubber piece but also to ensure the reliable functioning of the product throughout the life.
Creating a Resilient Railway System
With the expansion of railway construction in India, the importance of the local engineering and manufacturing sector will grow as well. A resilient railway system must include not only a lot of civil engineering work, but also the presence of special suppliers who can manufacture precision engineering solutions and adapt them to changing needs.
The railways of the future will be governed by a lifecycle approach to their operation. Various components will have to be evaluated not only in terms of the initial cost, but also in terms of their performance over a period of time taking into account such factors as repetitive loads, environmental influence, vibration, etc.
Rubber components in this regard may not take up significant physical space in the railway construction, but their contribution to structural safety and performance significantly outweighs their volume.
