Electro magnetic compatibility plays important role in railway signaling system


Various railways projects, allover the world, have a proper railway signaling system that ensures smooth traffic flow, along with the safe running of trains. Therefore, it is essential to have an efficient program in place which has electro-magnetic compatibility with other mechanical and electronic/electrical program in the integrated system. The need for such a system was felt to avoid the collision of the trains at any point in the route, while many trains operate on the particular route.

  • History of railway signals

Starting from the early days the rail signaling was known as Block signaling, which meant blocking of the train on a certain route to let the other train pass. .For this purpose the railway lines are divided into blocks so that only one train can pass through the block at a particular time However later on, fixed signals were erected on the poles located near the tracks to indicate the movement of trains. These signals being still in use have different colors to indicate the advice to the train driver for proceeding, stopping or waiting for some time. Modifying the railway signaling system, mechanical signals were installed which reduced the work for most of the gang men on the rail route.


  • Modern signaling system

The modern railway signaling system will require computerized operations, while having the proper synchronization of software and hardware to ensure the safety of the railway system, as per the standards laid out. .The required signalling system has to be quite robust and above all, it must have the electromagnetic compatibility with the other apparatus and equipment working in the rail system as such, whether on board or along the route.

The signaling system must be immune to the surrounding electronic or electrical devices operating within the railway system, so that it does not cause any harm or impair the functionality of these devices in any manner.

  • Requirements of the system

The requirements of any project for railway signaling system will broadly include the following:
* Scheme plan preparation that will include inspection of the site and the entire route; finalizing of project specification and signaling equipment design specification.
* Details of the signaling designs;, control cables and the input/output circuits.
* Level crossing designs and designs of Mechanical and relay based interlocking devices.
* Signal sighting and data preparation.

The subject of railways signals has many aspects and we will endeavor to bring the related information to readers in our forthcoming issues on important issues involved in the railways signaling system, as well as their corresponding electro magnetic compatibility. Meanwhile they can look at other topics to gain knowledge about many different issues



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