who we are
Tiwari and Company, established in2001 on 19th April, by S.R. Tiwari, with the motto of signaling works in Indian Railways, has covered the significant span of more than 16 years. The company has earned a name and renown because of its positive work, performed by a clique of adroit Engineers.
Panel Interlocking (PI) is the system used in most medium-sized stations on IR. In this, the points and signals are worked by individual switches that control them.
Route Relay Interlocking (RRI) is the system used in large and busy stations that have to handle high volumes of train movements.
Solid State Interlocking (SSI) is the brand name of the first generation processor-based interlocking developed in the 1980s by British Rail's Research Division, GEC-General Signal and Westinghouse Signals Ltd in the UK.