Introduction – A terrible train accident happened in Balasore, Orissa just a few days before in which a large number of people died and were injured. As per Railway Minister Ashwini Vaishnav, the main cause of the train accident in Balasore, Orissa is due to error in the electronic interlocking system.

A change or error in the electronic interlocking system may cause wrong or incorrect signalling or improper routing which forced the Coromandal Express off the main line and enter into the loop line that collides with a standing freight train. Let us understand what is the electronic interlocking system.

Electronic Interlocking System – It is a type of railway signaling system, which uses electronic components for controlling points and signals. It is designed to prevent collisions of trains by ensuring that signals are only cleared for proceeding if the route is clear. This system also refers to a safety mechanism that ensures efficient and safe operation of train movements at stations, signaling points, and junctions. This safety system also involves the integration of points (switches), track circuits, and signals.

Track circuits are electrical circuits that are installed on the track which detect the presence of a train and also help in determining whether a section of track is vacant or occupied that enable the interlocking system for controlling train movements accordingly. When applying or employing this system, it lowers the risks of potential accidents and collisions of trains, improves the efficiency of railway operations, and increases the overall safety. In the electronic interlocking system, the supervision and control of train movements via electronic and software components. This system also utilizes communication network, computers, and programmable logic controllers to coordinate and manage track circuits, signaling, and points.

This type of system makes sure that points or movable section of the track which enables trains to change direction from one track to another that are properly locked and aligned in the right position before a train passes over them. It ensures that signals are cleared for proceeding only if the route is clear and safe.