RAILWAY SIGNALLING

                      INTERLOCKING . " The safe reception of train and safe depture of an train is called Interlocking ". There Many other Definition  were Exists.  In particularly India  Signalling History there are  3 to 5 Interlocking types are Exists . 1. LEVER INTERLOCKING.  2.PANEL INTERLOCKING(PI) 3.ROUTER RELAY INTERLOCKING(RRI) 4. ELECTRONIC  INTERLOCKING(EI) ALSO SOMETIME REFERENCE AS SOLID STATE INTERLOCKING(SSI). Later in this tutorial  we will discuss breifly about this interlocking principles and operations.

               IMPORTANT OF TRANSPORTATION As you all know that Transportation is Most Important Part of Life , Without Transportation  it's very Difficult For Us To Imagine. In Those olden days Bull cattle, many other type of transportation were the things for people to move from one place to another place, later in 1760's, 1820's Transportation Revolution started. On 21 February 1804 first steam powered took place in South walses in the world.                         Where as india  first railway journey started on 16 April 1853 from bombay to thane.