CTW

 AMC visit  of Statcon and UFSBI  - 07 March 26

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27.Track Circuits

  As per new SEM,  Minimum length of Track Circuit is 26 m( Two rail length) Glued joint Insulation  Resistance- Not more than 25M ohms in dry conditions and not less than 3 k ohms in wet conditions. Glued joint are to be replaced after 250 GMT ( Gross million Tonnes) of Movement of Traffic. Stray Voltage - not more than 10 m Volt  track circuit upto 100m. 100mV for track circuit more than 100 metres. Stray current -  Not more than 10 mA for TC upto 100 Mts.  Not more than 100mA for length of TC is equal or above 100 mts. B type choke for 25 KV AC RE Area- 120 ohm impedence and 3 ohm Resistence. QTA2 - pick up voltage 1.40 v ,  pick up current should be 140 mA.Minimum Excitation is not less than 125% of rated pick up voltage.Maximum  Excitation is not less than 300% of rated pick up voltage for plug in type Track Relay. Configuration 2F1B.AC immunity is 50V AC. QBAT - pick up voltage 1.75V, max pick up current should be 175 mA.Minimum Excitatio...
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35.SLB, BSLB and Block Equipment

  SLB ( shunting limit board) It is used in single line B class Station working in Absolute block system, where Advanced Starter is not provided and Shunting is permitted in front of Approaching train.Its distance is 180 m ahead of Home Signal and it is facing towards station.A white light on the board will lit both in day and night Shunting in face of approaching train can be done only upto SLB.                  Dimension of rectangular board is 600 mm×1000 mm.Height of the bottom of rectangular board is 2 m from rail level .On the post there are alternate band of Black and White, each 300 mm wide. BSLB ( Block Station Shunting Limit Board)   It is used in double line B class station worked on absolute block system and placed 180m  ahead of home Signal when first point is trailing or there is no point. BSLB should be placed near Fouling Mark of the first point .Legend is facing towards station. A white light on the board wil...
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48.CRS , CST and PCE sanction

  Validity of CST sanction   is six months .Required when we are doing any changes in existing interlocking.e.g commissioning of BPAC Validity of CRS and PCE sanction are same (01 year). PCE sanction is required only for closing the LC gate.Earlier it was with CRS, now delegated to PCE. ESP,SIP,SWRD,PD and SWR required to be attached with PCE sanction.  Type of block working in any section approved by CRS. CRS sanction is must when do any change in interlocking,e.g.any new line is opened. Validity of CRS sanction is 01 year. CRS permission is required in following cases. a) Additions/extensions or alterations to the existing block, Signalling and interlocking installations b) Change in Block, Signalling and Interlocking installations. c) New stations temporary or permanent. d) Interlocking of level crossings, catch siding and slip sidings etc. e) For any kind of clubbing of Signal CRS Sanction is required. CST Sanction   CST Sanction required in following works 1) P...
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