Relaibility Action Plan - Three Phase Electric Locomotives (Rev '10', May'2014)

Balance 3-Phase electric locomotives to be completed

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Sno.EquipmentDescriptionAQKYNHWHGMOWATGZBLDHCNBRPMLGDTATABIABRCTKDTotal
1 Air DryerProvision of 3 A MCB (128.1) (RDSO/2009/EL/MS/0375 Rev ‘1’ dated 28.09.12)000001300 000000 
2 Air DryerReplacement of existing PCBs of air dryer to modified (opto coupler) PCBs in M/s FTIL make air dryer to avoid failure as per RDSO letter no SD.DFM.A 4.7.1.3 dated 13.02.093400000  0000090 
3 Auxiliary ConverterShifting of MCB-100 from BUR-III to HB-2 panel. (RDSO/2008/EL/MS/0367/Rev.‘0’ dated-29.08.08)00002011 3002500 
4 Auxiliary ConverterKnife contactor (female) position on its base plate in WRE module (1, 2, 3&4) and (3, 4, 5&6) in GG. modules to be ensured. 00000019 47000047 
5 Auxiliary ConverterModification to address failures of Auxiliary converter cards. (MS no. RDSO/2010/EL/MS/0389 (Rev.0), Dated 22.11.2010).Vide RDSO’s letter no.EL/11.5.5/5 dtd 12.04.12 the MS is to be read as RDSO/2010/EL/MS/0393 (Rev.0)000000   000047 
6 Auxiliary ConverterReplacement of 1mW crystal of 24 MHz by Jauch make 0.5 mW in PPB 471 cards having intermittent message (RDSO’s letter no. EL/11.5.5/5 dtd. 21.08.12).000000   000047 
7 Auxiliary ConverterReplacement of 1mW crystal of 24 MHz by Jauch make 0.5 mW in all PPB 471 cards having indegenised BAP ASIC during major schedule or whenever card is taken out (RDSO’s letter no. EL/11.5.5/5 dtd. 26.03.13).000000  40000047 
8 Auxiliary motorsRewinding of all Aux. motors except MRB/SCMRB by Corona restant wire (ref. RDSO's letter no. EL/2.2.8/17 dated 14.08.08)0 0 610   010000286 
9 Auxiliary motorsAll new motors procurement except MRB/SCMRB for indigenous sources must be with corona resistant wire only. (Ref. Amendment 32 spec no. E-10/3/09 (Motor)-Aug1997 issued vide EL/3.2.176/1 dated 28.01.2009.)  0 610    10000110 
10 Auxiliary motorsAll new motors procurement except MRB/SCMRB for indigenous sources must be with corona resistant wire only. (Ref. Amendment 32 spec no. E-10/3/09 (Motor)-Aug1997 issued vide EL/3.2.176/1 dated 28.01.2009.)  0 610   01001100 
11 Auxiliary motorsReplace MS impeller with Aluminum impeller.( Ref. CLW’s letter no ELDD/3743/CRH dated 08/05/09. For OCB).0000000 00050110 
12 Auxiliary motorsTo provide water discharge outlet in TM Scavenge Blower on WAG9, WAP5 & WAP7 class of locomotives.( Ref ELRS/MS/0328 Rev.’0’ dtd 29.10.03. For SCTM).000047480 000000 
13 Auxiliary motorsReplacement of 10 mm2 cable type 4GKW-AX (cable no.1147,1148 & 1149) of oil cooling unit with 16 mm2 cable type 4GKW-AX to improve the reliability of three phase loco.(RDSO/2010/EL/MS/0395 Rev.0 dated 28.02.11)11200260820 0000020 
14 BogieZonal Railways have been advised vide letter no. EL/3.1.35/2 (3-phase) dated 31.3.11 that in WAP-7 locomotives only imported hydraulic dampers should be used. For WAG-9 locomotives indigenous/imported dampers will continue to be used.40190000 41001205 
15 BogieModification of brake assembly of WAP7 Electric Locos, as per RDSO Modification Sheet No. RDSO/2008/EL/MS/0369(Rev. ‘0’) dated: 04/11/2008 0 0000  470000110 
16 BogieProvision of additional safety sling on brake lever of WAP7 Locos as per SMI No. RDSO/2006/EL/SMI/244 (Rev. ‘0’) dated: 02/04/2007.  00000 44 0000 
17 BogieUse of safety device as an emergency support to prevent falling of aluminum gearcase in WAP-5 class of electric locomotives, during run in the event of breakge of its mounting lug (of aluminum gearcase) due to sudden impulse loading (MS no. RDSO/2013/EL/MS/0424 (Rev. 0) dated 21.03.13)  00 3  47000560 
18 BogieFitment of Tie-Bars in WAP7 locomotives (Letter No. EL/3.1.35/2 (3-phase) dated 10.01.12)0 0000  000000 
19 BogieModification in brake hanger mounting bracket (Holder & Support) of WAP7/WAG9 locomotive (RDSO/2011/EL/MS/0396 Rev’0’ dated 17.10.11)-270089000 471180000 
20 BogieUse of all FS locknuts (Report RDSO/2011/EL/IR/0150 Rev’0’ of Aug’12)000000  000000 
21 Brake electronics (E-70)Provision of spacer in cards/electronic rack to avoid failures from Sl no. A02 (01.01.2002) to N07 (Dec’07).0 0000  4700000 
22 Brake electronics (E-70)Change of Regulator L7805 with LM140 in VCD card from Sl No. A08 (01.01.2008) to K09(01.09.2009)0 08500  4700000 
23 Brake electronics (E-70)Change of EC make electrolytic capacitors by Kemmet make in LPO card from Sl No A09(01.01.2009) to E09 (01.05.2009)0 012100  4700000 
24 Brake electronics (E-70)Change of EC make electrolytic capacitors by Kemmet make in Controller card from Sl No A09(01.01.2009) to E09 (01.05.2009)0 012100  4700000 
25 CCBSoftware modification to remove interlock of parking brake with BP reduction/ charging.0000 00 470000108 
26 CCBOne cycle replacement of Lead-trail function selector switch in all locomotives.0000 8  470000108 
27 CCBProvision of BP feed back during banking operation has been done through ZBAN switch in all units.0000 0  470000108 
28 CCBModification to protect water entry in DVC (to be done with the help of M/s.KBIL).00023 0  00000108 
29 CompressorChanging the orientation of suction filter in ELGI compressor .( RDSO/ ELRS / MS/0352 dtd 07.01.08).000000  000000 
30 CompressorChanging of CP delivery pipe in ELGI make type RR20100 by SAE-100 –R 1 pipe.000000  17001300 
31 CompressorProvision of safety sling in all compressor in RR20100 & 2A320D.0000000 000000 
32 CompressorModification for MCP control circuit (MS no. RDSO/2014/EL/MS/0427 Rev. 0 dated 23.10.2013)000001210 000000 
33 E-70 valveChange of Pankaj make potentiometer by imported potentiometer in DBC from Sl no. A02 (01.01.2002) to L08 (01.10.2008)0 0000  000000 
34 E-70 valveChanging of the stem of restricting valve assembly of E – 70 control unit000000   000034 
35 E-70 valveImported sleeve/ Imported EP-Valve to be provided in all EP valve of E-70 brake system.000000  0000034 
36 Filter CubicleProvision of inspection window on the side of filter cubicle. (RDSO/2008/EL/MS/0366 Rev ‘0’ dated 29.08.08)00000420 000000 
37 Flasher light & Head lightModification in control circuit of Flasher light & Headlight of 3-phase electric locomotives.(RDSO/2008/EL/MS/0357 Rev 0 dated 20.02.08)0000000 000000 
38 Flasher light & Head lightModification sheet for improving illumination of Head Light in Dimmer mode in 3-Phase electric locomotives (MS no. RDSO/2013/EL/MS/0425, (Rev. '0') dated 22.05.13)00005690 0048000 
39 Marker lightModification to be carried out to ensure the working of marker lights even if BL is in de-activated condition and Battery MCB (110) in off through battery supply for dead engine movement.(Disconnection of 2095 wire i.e. incoming feed to 310.7 MCB and provision of loop from 110 MCB (2021) to marker light MCB.( RDSO/2006/EL/MS/0344 Rev-0 dt.28.04.2006)0000000 000000 
40 Marker lightModification to avoid simultaneous switching ON/OFF white and red marker light in 3-Phase locomotives. (RDSO/2012/EL/MS/0411 Rev.’0’ dtd.5.6.120000000 000000 
41 OthersModification sheet for shifting the termination of 4GKW, 1.8 kV, 70mm2 cables and 2X2.5mm2 cables housed in lower portion of HB2 panel and provision of SRBGF sheet (RDSO/2011/EL/MS/0400 Rev’0’ dtd.10.8.11.)0000017  000000 
42 OthersStandardisation of power selecton switch position in flasher units provided in three phase electric locomotives. (RDSO/2012/EL/MS/0407 Rev.’0’ dtd.29.02.2012)0000000 000000 
43 OthersAuto switching of machine room / corridor lights to avoid draining of batteries in 3-phase electric locomotives (MS no. RDSO/2011/EL/MS/0403 Rev’0’ dtd. 30.11.11).0000000 000000 
44 OthersSMI for measurement of millivolt drop of contactor no.218 & 126.SMI no. RDSO/2012/EL/SMI/0275 Rev’0’ dtd 22.03.12.0 0000  000000 
45 OthersParalleling of auxiliary interlock of Filter Contactor 8.41 and Auxiliary contactors (RDSO/2012/EL/MS/0413 Rev’0’dated 28.09.12)000000  000000 
46 OthersModification to provide rubber sealing gasket in master controller of 3-phase locos.(MS no. RDSO/2012/EL/MS/0419 Rev.0 dated 20.12.12.00001700 00100000 
47 OthersProvision of change over switch in Traction Converter for speed sensor of Traction motor. (RDSO/2008/EL/MS/0371 Rev-0 dt.20.01.2009)0 24104 7713 46169000110 
48 OthersMeasurement of cable continuity for all four earthing brushes.0000009  00000 
49 OthersParalleling of interlocks of EP contactors and relays to improve the reliability of three phase locos (RDSO/2010/EL/MS/0390 Rev.0)000670013 1000000 
50 OthersPartial blocking of opening duct of back side of auxiliary converter of three phase electric locomotives. (MS no. RDSO/2009/EL/MS/ 0385 (Rev.0), Dated 15.12.2009)00000270 000000 
51 OthersModification in loco ckt for multiple unit operation for microprocessor based control and fault diagnostic system of 25 KV AC electric locos. RDSO/2010/EL/MS/0386 Rev ‘0’ dated 18.01.10.0024000  470052069 
52 OthersModification sheet for shifting the termination of 4GKW, 1.8kv, 70 Sq.mm. RDSO/2011/EL/MS/0400 Rev ‘0’ dated 10.8.1100000170 000000 
53 OthersModification sheet of Bogie isolation rotary switch (SCH.POS.154 Cutout switch) MS no. RDSO/2013/EL/MS/0426, (Rev. '0') dated 18.07.13.000000  000000 
54 OthersModification Sheet to provide mechanical locking arrangement in Primary Over Current relay. MS. No. RDSO/2013/EL/MS/0420, Rev.’0’ dated 23.01.13.0000000 000000 
55 OthersRemoval of shoting link provided at c-d terminal of over current relay (MS no. RDSO/2014/EL/MS/0432 rev. 0 dated 12.03.2014)0000000 000000 
56 OthersModification for relocation of each fault relays for Harmonic filter and Hotel load along with its registers (MS no. RDSO/2014/EL/MS/0428 Rev. 0 dated 10.12.2013) 00000260 4005500 
57 OthersRemoval of Orifice ring provided in the inlet & outlet flanges of converter oil coolers (COC) and Transformer oil cooler (TOC) of three phase (oil cooler assy. manufactured & supplied by M/s Apolo)(SMI no. RDSO/2014/EL/SMI/279 Rev. 0 dated 24.01.2014)60 01133030  47103020 50 
58 OthersModification sheet ( No. RDSO/2014/EL/MS/0434 'Rev-0 dated 28.03.2014) to create low pressure zone above hood ventilator in order to make machine room pressurized and free from dust to avoid failure of electronic cards in three phase locos.21340180170 000370 
59 Pneumatic valve(E-)Replacement of existing PRVs of polycarbonate body by high flow pressure limiting valve of metallic body in E-70 brake system during IOH & POH or whenever defective PRV is to be replaced. (Ref. RDSO letter no. EL/3.2.19/3-Phase dated 14.06.13.161 15109013  113505434 
60 Pneumatic valve(E-)Provision of DBC with imported potentiometer 000000  0000034 
61 Pneumatic valve(E-)Replacement of Teflon nut on isolator assembly on C3W manifold0002300  0000034 
62 Pneumatic valve(E-)Provision of Cu pipe in horn and wiper circuit in place of PVC and metallic braided flexible pipe.0003507  0000034 
63 Pneumatic valve(E-)Replacement of Metal seated NRV by PU seated NRV provided after compressor (Ref-RDSO’s letter no EL/3.2.19/3-Phase dated 11.09.2012)0000052  10018017 
64 Pneumatic valve(E-)Provision of isolating cock for unloader valves (12) in E-70 brake system as per RDSO’s MODIFICATION SHEET No. RDSO/2012/EL/MS/0412 Rev. ‘0’ dated 22.08.20120006000  0072000 
65 PT fuse.PT fuse modification as per RDSO/2009/EL/MS/0377 Rev ‘0’ dated 22.04.090000000 000000 
66 Software and control electronicsDown loading of software for modified unloader timings (5seconds after ramp down) in HBB1 and HBB2 cards.0000000 000700 
67 Software and control electronicsDown loading of software for modified logic for Battery voltage monitoring in BUR-2 and BUR-3.0000000 000000 
68 Software and control electronicsModification of software for avoiding isolation of harmonic filter in case of bogie-1 isolation.0000000 000700 
69 Software and control electronicsModification in 3-Phase electric Locomotives to record message of VCD isolation status in DDS (MS no. RDSO/2010/EL/MS/0397 (Rev.0), Dated 06.06.2011).0 060000 0360700 
70 Software and control electronicsModification in the software for recording of MCE OFF timing in DDS in 3-Phase loco.0000000 0360700 
71 Software and control electronicsModification in the software for isolation of bogie without “switching off” of MCE using rotary switch no. 154 in 3-Phase loco.0000000 000700 
72 Software and control electronicsModification in the software for detection of stuck-on position of BPCS switch and bringing the loco out of the constant speed loop if BPCS stuck-on position is detected 0000000 0360700 
73 Software and control electronicsRehabilitation and replacement of electrolytic capacitors,SS & RM optical sensors and EPROM after six years as per Annexure -1 of RDSO guideline no. ELG/2008/01, Rev. ‘1’dated 13.08.09.4764031 130 406527026 
74 Software and control electronicsRemoval of interlocks of control ckt contactor no.126 from MCPA ckt. RDSO/2011/EL/MS/0399 Rev ‘0’ dated 9.8.11.00000019 000000 
75 Software and control electronicsDownloading of software with reduced severity of messages from NSC/ASC such as ‘Error Comparator’, ‘Error Transducer”, ‘Error Calibration’, ‘Error Plausibity’ vide CLW letter no. C-D&D/T/21 dated 31.07.120000 0  0000047 
76 Software and control electronicsSoftware modification of FLG to reduce severity of life sign missing problem from other processors (except for NSC & ASC). (CLW letter no. C-D&D/T/21 dtd. 08.09.12 )000000  0000047 
77 Software and control electronicsUse of 8 Amps rating reed relay in Digital I/O board (URB512D15) used in VCU of 3-phase electric loco vide RDSO letter no. EL/11.5.5/5 dtd. 28.12.12.7307413720 20017500 
78 Software and control electronicsSoftware modification of FLG to reduce severity of life sign missing problem and isolation of auxiliary converter .(RDSO’s letter no. EL/11.5.5/4 dtd. 9.04.12)000000  000000 
79 Software and control electronicsDownloading of latest software (ref. CLW letter no. C-D&D/t/21 dated 29.07.13) for following improvements: (i) Modification in ALG & SLG software to adress masseges ASC1/2: 0074-ADC timeout. , ASC1/2: Error clock frequency 1, SLG1/2: Dist. Communication NSC-SLG, SLG1/2: Lifesign from FLG missing, SLG1/2: SLG1 pulsing stopped, SLG1/2: NSC1 Pulsing stopped, SLG1/2: Timeout ALG without PTO, SLG1/2: Verification Bogie BUR1 Distrubed. (ii) Modified logic of temperatuer sensing.0000 00 1000047 
80 Software and control electronicsDowloading of Adhesion improvement software of processor NSC, ASC & SLG in WAG9/WAP9H as per CLW letter no. EL/3.1.35/26 dated 11.09.13.00220 00  000047 
81 Software and control electronicsModification for avoiding nessecity of cab changing in case of failure of processor cards of VCU of WAG9/9H (MS no. RDSO/2014/EL/MS/0429 Rev.0 dated 26.02.2014)13252110380  47254037059 
82 Software and control electronicsModification for avoiding nessecity of cab changing in case of failure of processor cards of VCU of WAP7 (MS no. RDSO/2014/EL/MS/0435 Rev.0 dated 06.06.2014)15 0 063  28003060 
83 Traction converterTesting of URB512 D15(Digital I/O Board Computer) and URB177 D15 (Digital I/O Board Computer) used in VCU & SR (SMI no. RDSO/2013/El/SMI/0277, Rv. 0 Dated 02.01.14    104 0  47 1006800 
84 Traction converterReplacement of 1mW crystal of 24 MHz by Zauch make 0.5 mW in PPA988 cards and PPB622 cards(RDSO’s letter no. EL/11.5.5/5 dtd. 13.04.12).0000 0  403120000 
85 Traction converterProvision of thermoelectric cooling module in 05 locos at GMO0 00 0  4700000 
86 Traction converterInsert insulating plate of glass epoxy, FR-4 grade material with size 250x10x1.6 mm between gate and cathode plate to avoid failure of gate unit. (RDSO/2009/EL/MS/0378, dated 29.05.09)0 00 7519 0000047 
87 Traction converterInstruction for development of testing set up of gate unit of Traction Converter for 3-Phase electric locomotives. (RDSO/2010/EL/SMI/0263 , Rev.’0’ dtd.27.07.2010)  00 019 47 00047 
88 Traction converterReplacement of ECSX make 24 MHz crystals by FOX make crystals in electronic cards of three phase electric locomotives (MS no. RDSO/2010/EL/MS/0391 (Rev.0), Dated 04.02.2011) PPA 9880 00 019 000000 
89 Traction converterReplacement of ECSX make 24 MHz crystals by FOX make crystals in electronic cards of three phase electric locomotives (MS no. RDSO/2010/EL/MS/0391(Rev.0), Dated 04.02.2011) PPB4710 00 019 7 0000 
90 Traction converterReplacement of ECSX make 24 MHz crystals by FOX make crystals in electronic cards of three phase electric locomotives (MS no. RDSO/2010/EL/MS/0391 (Rev.0), Dated 04.02.2011) PPB6220 00 019 0 0000 
91 Traction converterProvision of modified cooling radiators for better cooling of traction converter control electronics. RDSO letter no. EL/11.5.5/5 dtd. 15.02.10.32 00 1019 0030047 
92 Traction converterSMI to arrest failures of KUK make DC link voltage sensor in Traction Converter of 3-Phase electric locomotives. (SMI No. RDSO/2011/EL/SMI/0268 Rev. ‘0’, Dtd. 13.05.11)0 00 019 30000096 
93 Traction converterTesting set up for SAP cards and sensors (SMI 260)0 26104 11019 400043047 
94 Traction converterChecking of Gate Unit cards by measuring dBm level of QFBR-1478C transmitter (component no.151). (RDSO/2009/EL/SMI/0257,dated 22.05.09)0 240 019 0000047 
95 Traction link, housing and related itemsOne cycle DPT of traction bar (Letter No. EL/3.1.35/2 (3-phase) dated 17.09.12) 0000000 000000 
96 Traction link, housing and related itemsProvision of modified traction link flange mounting bolts in WAG-9 & WAP-7 3-Phase loco. RDSO/2006/EL/SMI/241 dated 24.10.06.0 0000  0000073 
97 Traction motorModified interferences TM assembly components in order to ensure adequate interference between assembly components of traction motor tye 6FRA6068. Modification sheet no. RDSO/2012/EL/MS/0415 (Rev. 0) dated 03.10.12.15700145 383   58410050079 
98 Traction motorInstructions for fitment of traction motor drive end bearings NU2236 used in three traction motors type 6FRA6068 (SMI no. RDSO/2013/EL/SMI/0278, Rev. 0 dated 24.12.2013  00 0  4757610045076 
99 Traction motorModification in fixing arrangement of temperature sensor fitted on TM for WAG9 & WAP7 locos .(RDSO/2007/EL/MS/350 Rev‘0’ dtd 1.11.2007.36000000 000000 
100 Traction motorReplacement of stators with modified stators with the provision of additional support to the stator windings overhang portion within the limited space available in the existing motor frame.( ELRS/MS/0355 Rev2 18.11.10).701018 00 4734510027041 
101 Traction motorReplacement of suspected labyrinth of 156 nos. (loco No. 31156 to 31179)with SGCI labyrinth assembly0 00 013 4400000 
102 Traction motorModification of Drive End-Outer Labyrinth .( ELRS/MS/0314 dated 12.07.02) & replacement of End shield with SGCI material of traction motors type 6FRA 6068 for WAP7 loco 00068 00 4700000 
103 Traction motorModification in TM cable circuit of WAP-5 locos. RDSO/2008/EL/MS/0370 dated 26.11.08.0 00 37  4700000 
104 Traction motorProvision of Grease outlet channel at NDE side of TM type 6FRA 6068 used in WAG-9 and WAP-7 loco.. RDSO/2010/EL/MS/0387 dated 7.7.1074006801620 019601034 
105 Traction motorAction plan for improving reliability of Rotors of 6FRA 6068 used in WAG9/WAP7 locomotives. ( DO letter no. EL.3.2.182 ,dt.06.06.2008 ) Regular cut-in for manufacturing /repair with Sch- 1 and 2 RDSO’s letter no. EL.3.2.182 dt. 20.04.2012)0 083 0  4756610033028 
106 Traction motorMounting Arrangement of Bellow for Traction motor type 6FRA6068 of WAG9/WAP7 class of Electric Locomotives. Amendment No. 1 of Modification Sheet No. RDSO/2009/ELRS/MS/0373 for Retro Fitment ,EL.3.2.85 Rev. '1' Amendment 2 dt. 15.04.13. 98201655160  18204816028 
107 Traction motorMounting Arrangement of Bellow for Traction motor type 6FRA6068 of WAG9/WAP7 class of Electric Locomotives. Amendment No. 1 of Modification Sheet No. RDSO/2009/ELRS/MS/ 0374 (Rev. ‘1’) Amendement 2 new manufacturing, EL.3.2.85 dated 15.04.13.02016010  47 4800110 
108 Transformer LOT 6500/7500 KVAShifting of conservator from OCB dome to an independent stand provided adgacent to OCB dome in 3-Ph drive locomotives as per RDSO Modification Sheet No RDSO/2008/EL/MS/0360, Rev 1 , Jan,2011. 000001110 0000270 
109 Transformer LOT 6500/7500 KVAReplacement of phosphor bronze washers with spring steel conical M-30 bellevile washers in core coil clamping tie rod in 2019 ... series of BHEL make transformer as per RDSO's letter no. EL/3.2.1/3-Phase dated 27.12.12.0 0 00  000001 
110 Transformer LOT 6500/7500 KVAConduction of DGA on priority basis of AAW series (16 TFPs) and AAU series (28 TFPs) and taking up the matter with ABB for their rectification as RDSO's letter no. EL/3.2.1/3-Phase dated 18.01.2013. 1 01 0  00000110 
111 VCBDevelopment of maintenance infrastructure in sheds/workshops (Letter No. EL/3.2.61 dated 24.02.12)0 00 0  47010000110 
112 VCBReplacement of defective auxiliary switches and suspected CMDEs (with 12 terminals) by corrected auxiliary switches and modified CMDEs (with 14 terminals) (Letter No. EL/3.2.61/BT dated 30.12.11)0000 0  00000110 
113 VCBUp-gradation/conversion/modification of single bottle VCB type BVAC 25.10 of M/s AAL . Railway Board’s letter No. 2007/Elect/(TRS)/441/10 dt. 06.02.08.0 00 0  0000059 
114 VCBReplacement of metallic corrugated steel pipe/outside steel braided flexible pipe by flexible reinforced rubber pipe connected in between VCB and Air drier and main air pipe line to Air drier. ( ELRS/MS/0340(Rev.‘0’) dt. 29.06.05).000000  000000 
115 VCBModification in BT make VCBs supplied after Dec, 2007. RDSO’s letter No. EL/3.2.61/BT dt. 30.07.2009.0000 0  00000110 
116 VCB“Up-gradation/modification of single bottle VCBs type BVAC 25.10(old version) and BVAC 25.10 MO7(old ) of M/s BTIL to BVAC 25.10 MO7(New) as per Railway Board’s letter no. 2007/Elect(TRS)/441/10 dtd. 3.5.10.0000 0  0588700110 
117 VCBImplementation of modification No. RDSO/2006/EL/MS/0345, Rev’0’ dt. 08.05.06 for interchangeability of VCBs between 3-phsae locos & conventional locos. 137000 0  100100650110 
118 VCUAvoiding necessity of cab changing in case of failure of processor cards of VCU of WAG9/WAG9H three phase locomotives. Mod. No. RDSO/2014/EL/MS/429,Rev.'0' dated 26.02.201413252010380  47254037059 

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