Basics of signaling describes the requirement of signaling system.  Principles of interlocking decides the safety features to meet the requirements.

Any system requires a presentation and documentations. The signaling drawings are not an exception.

Railway is a growing industry, globally. Every system and equipment engaged in train running needs to be revamped

In earlier modules you studied various concepts, building the signaling logic. Either it is relay interlocking or electronic interlocking

Signaling is a developing technology. The travel has taken from mechanical signaling to present metro technology.

Table of control or Control table is a heart of the signaling system. Irrespective of type of interlocking, maybe it is,

Track circuit is one of the oldest methods of track detecting devices. Even in today’s modern signaling systems, track circuits are adopted.

Railway globally are switching over to pollution less transportation. On Indian Railway more than 50% route kilometer is provided with Electrification.

Interlocking is a process. It can be achieved mechanically, electro-mechanically, relays or electronically. There are many advantages with Electronic Interlocking.

Ensuring safety of trains is the utmost priority of Signaling. Many systems are introduced to achieve these feet.

Any system requires a presentation. The signaling drawings are not an exception. Earlier the related drawings and tables were hand drawn. 

Power supply for any system is like heart of the system. With the introduction of new technologies power supply plays an important role.

Signaling system ensures safety of trains. The safety is assured through an “interlocking process”. These principles called as “Essentials of Interlocking”

With the growing technology in signaling interlocking process and systems, it becomes mandatory to verify and validate the process of interlocking.