Railway Button Description and Button Nomenclature

Railway Button Description and Button Nomenclature

Basic Concepts of Railway Signalling

Button Description and Button Nomenclature

Individual Button Description
• GN – Signal Button Red
• UN – Exit or Route Button White or Grey
• WN – Individual Point Button Black
• NWWN – Common Normal Point Button Black with red dot

• RWWN – Common Reverse Point Button Black with red dot
• EWN – Emergency Point Operation Button Blue with red dot
• COGGN – Common Calling-on Signal Button Red with white dot
• EUYN – Emergency Route cancellation Button Red with white dot
• RRBUN – Super emergency route cancellation Button Red with White dot
• GBN – Group Slot Release Button Blue

• GRN – Group Slot restoration Button Blue
• EOVN – Emergency Overlap Release Button Red with white dot
• EGGN – Emergency Signal Cancellation Button RED
• G-31 N – Gate Button Brown
• RRBUSN – Emergency Route Release Signal Key to be operated by Signal Staff

Counters provided on the Panel

• COGGN – For recording Calling-on Signal operation
• EOVN – For recording Overlap Emergency Cancellation
• EWN – For recording Emergency operation of points under Track Circuit failure

• EGGN – For recording emergency cancellation of signal
• RRBUNR – For recording route cancellation under emergency with track circuit failure

• EUYN – For recording route cancellation under emergency without track circuit failure
• Emergency/Normal Crank Handle Counter For recording crank handle extraction

Buttons to be pressed for various operations

• To clear a Main or Shunt Signal: GN + UN
• To clear a Calling-on Signal: Calling-on GN + COGGN. Then leave COGGN, press UN
• To put any signal to ON: GN +EGGN
• To operate a point with no track circuit failure: Individual WN +{NWWN or RWWN}, depending on need to take it to N or R.

• To operate a point under track circuit failure: {NWWN or RWWN} + EWN. Then leave EWN and press individual WN.
• To give control to L.C. gate to open: Gate button + GBN
• To take control back from L.C.: Gate Button + GRN
• To release a route after putting the signal to „ON‟ by pressing GN + EGGN if track circuits are functioning normal.
• GN + EUYN Then after 2 minutes ALSR will pick up. OVSR will pick up thro ALSR front contact. Thus Route and Overlap get released.
• To release a route that does not get unlocked after the train has arrived due to track circuit failure..

• Signal staff has to insert their key in the panel and turn. Then GN + RRBUN will be pressed by ASM. After 2 minutes ALSR will pick up. OVSR will pick up thro‟ ALSR front contact. Thus Route and Overlap get released.
• To release overlap manually, if does not get released after the arrival of the train.
• Press GN + EOVN. After 2 minutes overlap will be released.
• To release a crank handle for manual operation of point: Press concerned point CH N + GBN
• To take the control of crank handle: Press CH N + GRN

Audible Alarms

• Any Button stuck alarm.
• Any point or signal failure alarm.
• To stop the alarm, ASM has to press an Acknowledge button. But visual failure
indication will continue, till failure is attended and cleared.

Indications on the Panel

• Point position indication i.e., Normal or Reverse.
• Signal aspect indication i.e., red or yellow or green or double yellow.
• Route set and locked indication.
• Track occupied indication.
• L.C.Gate indication i.e., closed or open.
• Crank handle position: in or out, free or not free.
• SM‟s Key in or out.
• Point locked or free.
• Which group button has got stuck? i.e., signal/point/common button

Block Indications
• Line clear
• Train passing Advanced starter
• Auto-TOL
• Block section clear

Sequence operation of relays for signal clearance (Refer Fig. 7.02).
• SM‟s Key is in and GN + UN buttons are pressed.

Relays that pickup                         Relays that drop
• SMR, GNR, UNR
• LR
• NWR or RWR                                        RWR or NWR
• NWPR or RWPR                                 RWKR or NWKR
• NWKR or RWKR
• UCR
• ALSR,OVSR,WLR

Relays that pick up                                    Relays that drop
• UHR,UECR
• HR                                                                               RECR
• HECR
• Train passes signal                                                Track relay
• RECR,TSR1                                                   TSR,LR,UCR,HR,HECR
• TSR2 etc., TSSLR
• Train clears last point and fully arrives on berth track.

Sequence of relay operation

Relays that pick up                                           Relays that drop
• TRs, ALSR                                                            TSR1,TSR2 etc., TSSLR
• With time delay OVSR
• TSR,WLR

 

 

Leave a Reply

Your email address will not be published. Required fields are marked *