Approach locking – Railway Signalling Concepts

Overlap Stick Relay Circuits - OVSR & OVJSLR

Railway Signalling SMR SMCR TSR UCR ASR ALSR UYRs OVSR OVJSLR Circuits

June 6, 2022June 6, 2022admin4 Comments

Railway Signalling SMR SMCR TSR UCR ASR ALSR UYRs OVSR OVJSLR Circuits SMR/SMCR CIRCUIT This relay is energized when the SM’s panel key is `IN’ and turned to Normal. The Energisation of SMCR/SMR relay provides authorized operation of all the functions on the panel. When SM’s key is turned to reverse and taken out from […]

Railway Control Table

June 1, 2022June 1, 2022adminLeave a Comment

Railway Control Table What is a control table? A control table is a formal tabulation of the signal, point, and other controls associated with an electrical or electronic signalling system, showing the interlocking and other dependencies between those controls. Safety is dependent on the readability of control tables and on their interpretation by competent persons. […]

Railway Electrical Lockings

April 4, 2022June 7, 2022admin1 Comment

Railway Electrical Lockings Route locking: After a route is set (that is, the points in the route are operated to the position as required for the route), it is electrically locked before the signal is cleared. By this we mean the points in the route are electrically locked and they cannot be operated for any […]

OVERLAP & FLANK PROTECTION RAILWAY SIGNALLING

April 4, 2022June 7, 2022admin1 Comment

OVERLAP FLANK PROTECTION RAILWAY SIGNALLING OVERLAP The distance beyond a stop signal which must be clear and where necessary locked in order to clear previous signal. Background The purpose of an overlap is to provide an unobstructed portion of line beyond the exit signal reserved in case the train passes the exit signal at danger. […]

Railway Dead approach locking|Back locking or route locking

March 4, 2022June 7, 2022admin3 Comments

Railway Dead approach locking|Back locking or route locking Dead approach locking: It is seen that for providing approach locking, a track circuit for a length of 1,2kms. Need to be provided. Provision of such a long track circuit for the purpose of approach locking is a costly proposition. Therefore, the approach locking is provided without the […]