What is Interlocking and their types in Railway

1. WhatisInterlocking System and theirtypes in Railway By : - Er. Nagmani Kumar Founder – (SIGNAL ENGINEERS YouTube Channel)

2. Interlocking In railway signalling, an interlocking is an arrangement of signal apparatus that prevents conflicting movements through an arrangement of tracks such as junctions or crossings. The signalling appliances and tracks are sometimes collectively referred to as an interlocking plant. An interlocking is designed so that it is impossible to display a signal to proceed unless the route to be used is proven safe.

3. Interlocking Display VDU based control terminal. It shall be capable of future interfacing with ATP & CTC systems, TPWS, ETCS, Radio Blok Centre & other advanced systems.

4. Configuration and use Increase speed Increase route of signal and point Increase safety Modern technology Interlocked With each other

5. Types Interlocking key interlocking Mechanical interlocking Electro-mechanical interlocking Relay interlocking Electronic interlocking CBI (Computer Based Interlocking)

6. Key interlocking key interlocking utilizes locks and keys for sequential control of equipment and machinery to ensure safe operation. Trapped key interlocks are widely used to ensure safe access to potentially live or dangerous plant or equipment in an industrial setting.

7. Mechanical interlocking Mechanical interlocking provides the control of a railway area through the movement of individual levers, physically connected via wires and rods to signals, points, level crossing gates or barriers.

8. Electro-mechanical interlocking Power interlockings may also use mechanical locking to ensure the proper sequencing of levers, but the levers are considerably smaller as they themselves do not directly control the field devices. If the lever is free to move based on the locking bed, contacts on the levers actuate the switches and signals which are operated electrically or electro-pneumatically. Before a control lever may be moved into a position which would release other levers, a signal must be received from the field element that it has actually moved into the position requested. The locking bed shown is for a GRS power interlocking machine.

9. Relay Interlockig /Electrical Interlocking Interlocking with help of relay.

10. Panel Interlocking (PI) Panel Interlocking (PI) is the system used in most medium-sized stations on IR.

11. Route Relay Interlocking (RRI) Route Relay Interlocking (RRI) is the system used in large and busy stations that have to handle high volumes of train movements. In this, an entire route through the station can be selected and all the associated points and signals along the route can be set at once by a switch for receiving, holding, blocking, or dispatching trains.

12. Electronic Interlocking System(EI ) Electronic Interlocking System. Electronic Interlocking (EI) system is a microprocessor based interlocking equipment to read the yard and panel inputs; process them in a fail-safe manner as per selection table and generate required output.

13. Computer-Based Interlocking Systems Computer-based interlocking systems lock and release train routes on main line and mass transit systems. They supervise and control wayside objects such as signals, point machines and level crossing protection. Reduced physical footprint Workflow-orientated tool suite One common platform Reliability Flexibility Complete railways

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