Letter No.

Date

Description

Year-2025

CORE-HQ0ELEC(MP)/66/2024

16.07.2025

Guidelines regarding Provision of additional bonding plate connecting strip on portal and TTU uprights for connecting bonds when they are provided on platform.

RDSO-TI0LKO(CIV)/1/2020/-O/o PED/TI/RDSO-Part(2)

14.07.2025

Guideline regarding provision of additional bonding plate connecting strip on portal and TTU uprights for connecting bonds when they are provided on platform.

CORE-HQ0ELEC(MP)/29/2021-O/o CAO/CORE/PRYJ

19.06.2025

Revised eligibility criteria for procurement of decontrolled items-traction power transformer of 21.6/30.24MVA, 110/27 kV and 66/27kV

CORE-HQ0ELEC(MP)/5/2022

16.06.2025

Letters regarding transfer of various CORE Controlled Items from CORE to RDSO

RDSO-TI0LKO(PSI)/17/2021-O/o PED/TI/RDSO-Part(1)

14.06.2025

Revised eligibility criteria for procurement of decontrolled items-traction power transformer of 21.6/30.24MVA, 110/27 kV and 66/27kV.

CORE-HQ0ELEC(MP)/5/2022

10.06.2025

Letters regarding transfer of Jumpers, AT & ATCLS Panel from CORE to RDSO.

CORE-HQ0ELEC(MP)/5/2022

05.06.2025

Letters regarding transfer of Manual Isolators from CORE to RDSO

CORE-HQ0ELEC(MP)/5/2022

02.06.2025

Letters regarding transfer of Lightning Arresters (LA) from CORE to RDSO

CORE-HQ0ELEC(MP)/6/2023-O/o CAO/CORE/PRYJ

07.05.2025

Removal of Items from CORE Vendor Directory

CORE-HQ0ELEC(MP)/6/2023

07.05.2025

Removal of Gearless Hand Operated Pulling and Lifting Machine & Ratchet Lever Hoist (Pull Lift)

CORE-HQ0ELEC(MP)/5/2022

16.04.2025

Letters regarding transfer of RDSO Transferred Items from CORE to RDSO

CORE-HQ0ELEC(MP)/5/2022

20.03.2025

Letters regarding transfer of Continuous Cast Copper (CCC) Wire Rod, Catenary Wire & Contact Wire from CORE to RDSO

CORE-HQ0ELEC(MP)/5/2022

18.03.2025

Letters regarding transfer of Traction Power Transformer from CORE to RDSO

CORE-HQ0ELEC(MP)/5/2022

19.02.2025

Letters regarding transfer of Single Pole VCB & Single Pole VI from CORE to RDSO

CORE-HQ0ELEC(MP)/4/2022

04.02.2025

Revision of specification for CORE controlled item 4200011, Automatic changeover Control panel for Colour Light Signaling 30, 60, 150 & 300 A 

CORE-HQ0ELEC(MP)/5/2022

18.01.2025

Letter regarding transfer of Current Carrying Dropper Assembly 

CORE-HQ0ELEC(MP)/119/2022

08.01.2025

Regarding failure of 65 sq mm Cu-Cd Catenary Wire.

Year-2024

   CORE-HQ0ELEC(MP)/5/2022

05.12.2024

Development of sources of Parallel Clamp (20/20) (234 sq.mm Aluminium feeder spider to 160 sq.mm copper jumper) as per Drg. No. ETI/OHE/P/1550 Rev F

   RDSO-TI0/OHE/62/2020

02.12.2024

Development of sources of Parallel Clamp (20/20) (234 sq.mm Aluminium feeder spider to 160 sq.mm copper jumper ) as per Drg. No. ETI/OHE/P/1550 Rev F.

  CORE-HQ0ELEC(MP)/4/2022

14.11.2024

Letter to Vendors regarding discontinuation of inhibited Mineral Insulating Oil as per IS: 335 (Type-II)

CORE-HQ0ELEC(MP)/4/2022

14.11.2024

Regarding discontinuation of Inhibited Mineral Insulating Oil as per IS: 335 (Type-II)

CORE-HQ0ELEC(MP)/4/2022

14.05.2024

Standard of Inhibited Mineral Insulating Oil to be used in Transformers of Indian Railways.

CORE-HQ0ELEC(MP)/4/2022

01.05.2024

Implementation of Instruction No. TI/IN/0049 for relay setting guideline for Delta-1 & Backup DPR relay provided as per RDSO Specification no. TI/SPC/PSI/ PROTCT/1982 with A&C Slip- 1 or specification no. TI/SPC/PSI/PROTCT/6072 at 25 kV AC Traction Sub-station and Budget provision in IRPSM Works for meeting the additional expenditure towards newly added Cyber security features in the SCADA System

CORE-HQ0ELEC(MP)/66/2024

15.03.2024

Informing about RDSO instructions for Use of G.I. type Nut & Bolts in existing P.G. Clamps

RDSO-RDSO/614/2022

05.03.2024

Use of G.I type Nut & Bolts in existing P. G. Clamp

ELCORE/MP/OHE

20.02.2024

Regarding development of item 25 kV Porcelain Operating rod, Post & Sectioning insulator with 1050 mm CD.

CORE-HQ0ELEC(MP)/66/2024

18.01.2024

Development of Raised Register Arm Bent Adjuster (R.I.: 2432-1) as per RDSO drawing no TI/DRG/OHED/RRABA/00001/23/0

RDSO-TI0LKO(OHE)/11/2020

09.01.2024

Development of sources of Raised Register Arm Bent Adjuster as per Drg. No. TI/DRG/OHED/RRABA/00001/23/0 for field trail

ELCORE/MP/Equipment/Policy

08.01.2024

Ensuring quality of work, safety at work site and timely delivery of projects-Reg

Year-2023

Railway Board’s letter No.2003/Elect(G)/161/I/Vol-III/Pt-Part(5), E-3442567

04.10.2023

Shifting of Vendor Development activities for items with CORE to RDSO

Railway Board’s letter No. 82/EEM/250/1 Part-3 E-3420012

25.09.2023

Provision of AT supply in Object Controller (OC) rooms of S&T installations

CORE-HQ0ELEC(MP)/4/2022

10.08.2023

Bushings to be used with the Traction Power Transformer in Indian Railways.

RDSO-TI0LKO(PSI)/59/2021-O/o PED/TI/RDSO

08.08.2023

Bushings to be used with the Traction Power Transformer & Autotransformer in Indian Railways.

ELCORE/MP/OHE/RDSO/SPEC

01.06.2023

Revision of RDSO Specification no. ETI/OHE/27(8/84) with A&C no. 1 for manufacturing and supply of Section Insulator Assembly without sectioning insulator.

ELCORE/MP/PSI/21/1

26.05.2023

Revision in specification of 25 kV Single Pole Vacuum Circuit Breaker and Interrupters from existing specification no. TI/SPC/PSI/LVCBIN/ 0120 (Dec.2013) Rev 0 with A&C slip no. 1 to TI/SPC/PSI/LVCBIN/0121(05/2023)effective from 25.05.2023 by RDSO.

ELCORE/MP/34(Copper)Scrap-Part-1

24.03.2023

Utilization of copper cut pieces available in RE projects

ELCORE/MP/RDSO/SPEC/OHE

17.03.2023

Revision of RDSO Specification no. TI/SPC/OHE/INSCOM/1071 Rev-1 for Silicone Composite insulators for 25 kV AC 50 Hz Single phase overhead traction lines.

ELCORE/MP/OHE

17.03.2023

Revision of RDSO Specification no. 1.TI/SPC/OHE/INS/0070 with A&C no.1&2 for Solid Core porcelain insulators for 25 kV AC 50 Hz single phase xcoverhead traction lines 2. TI/SPC/OHE/POST/0100 (01/2010) for solid core porcelain post insulators for 66 kV, 110 kV, 132 kV, 220 kV.

RDSO-TI0LKO(OHE)/39/2020

08.02.2023

Revision of RDSO’s Specification Nos. TI/SPC/OHE/ATD/0060 (Rev.1), TI/SPC/OHE/3PHTATD/0150 with A&C Slip-1 and TI/SPC/OHE/5PATD/0130 with A&C Slips-1,2&3 into one after merging as TI/SPC/OHE/ATD/0060 (Rev.2) for “Three Pulley Type Regulating Equipment with modified Pulley Groove, Three Pulley Type Regulating Equipment with 2400 KGF Tension & Five Pulley Auto Tensioning Devices for 25 kV AC Traction.

RDSO-RDSO/614/2022-O/o PED/TI/RDSO

20.01.2023

Vendor Development for Rail Earth Clamp Assembly as per RDSO’s Drawing No. TI/DRG/OHED/RECLAMP/RDSO/00009/22/0.

Railway Board’s letter No. 2015/RS(G)/779/5(Vol.III)

20.01.2023

Implementation of Public Procurement (Preference to Make in India) Order, 2017-Notification of RE items under para-3(a) of PPP-MII Order

Year-2022

RDSO-TI0LKO(PSI)/29/2021-O/oPED/TI/RDSO

29.11.2022

Drawings of connectors of 80 mm bus bar for use in 25 kV traction systems.

Railway Board’s letter No.2003/Elect(G)/161/I/Vol-III/Pt-(Part-2), E-3408251

26.10.2022

Transfer of 132/27 kV, 21.6/30.24 & 30/42 MVA, Single Phase, 50 Hz Traction Power Transformer

CORE/S/PVC/Review

20.10.2022

Price Variation Clause

ELCORE/MP/decontrolled items

12.10.2022

Eligibility criteria for decontrolled items of CORE.

RDSO-TI0LKO(PSI)/17/2020-O/o PED/TI/RDSO-Part(1)

03.08.2022

Decontrol/Transfer of Electrical items (Battery Chargers).

RDSO-TI0LKO(OHE)/11/2020-O/o PED/TI/RDSO-Part(1)

28.07.2022

Development of packing Saddle (RI No. 1374) and Raised Register Arm Clamp (Drawing No. ETI/OHE/P/1370-1 Rev J)

ELCORE/MP/ALD/FIT/410 Part-I

15.07.2022

Devolopment of prototype sample of Current Carrying Dropper Fittings suitable for current carrying flexible droppers of 10 mm²

RDSO-TI0LKO(PSI)/17/2020-O/o PED/TI/RDSO-Part(1)

11.07.2022

Decontrol/Transfer of electrical items.

RDSO/614/2022-O/o PED/TI/RDSO

08.07.2022

Development of Current Carrying Dropper Fittings suitable for current carrying flexible droppers of 10 mm²

ELCORE/ALD/FIT/410 Pt.I

01.07.2022

Removal of items from CORE vendor directory.

Railway Board’s letter No.2021/RS(G)/779/4

09.06.2022

Transfer, discontinuation and decontrolling items from various approving agencies of Indian Railways

Railway Board’s letter No.2021/RS(G)/779/4

30.03.2022

Procurement from approved sources-Vendor Directory

Railway Board’s letter No.2021/RS(G)/779/7

25.03.2022

Implementation of Unified Vendor Approval Module (UVAM)

RDSO-TI0LKO(PSI)/52/2020-O/o PEC/TI/RDSO-Part(1)

22.03.2022

Removal of 06 items from RDSO vendor directory.

Railway Board’s letter No.2021/RS(G)/779/7

16.03.2022

Implementation of Unified Vendor Approval Module (UVAM)

TI/CIV/MS/2020

11.03.2022

Modification in the RDSO drawings for inclusion of Weight of Galvanization for different OHE Structures.

QAE/TRNPWR/Policy/E-Pol-2

10.03.2022

Decontrol/Transfer of Electrical items.

ELCORE/ALD/FIT/410 Pt.I

08.03.2022

Development of prototype sample for TEE/STRAIGHT Connectors & LUG suitable 20 mm GS wire to 20 mm GS wire in Forged Steel Galvanised.

Railway Board’s letter No.2003/Elect(G)/161/I/Vol-III/Pt-Part(1)

25.02.2022

Proposal for decontrol/transfer of Electrical Items from RDSO

Railway Board’s letter No.2021/RS(G)/779/7

18.01.2022

Vendor Approval Process- ensuring transparency and competition.

Year-2021

ELCORE/MP/OHE/21/01

03.12.2021

Development of prototype  sample of Current Carrying Dropper Fittings as per RDSO Specification No. TI/SPC/OHE/Fittings/0130(10/13) Rev. I.

ELCORE/MP/Vendor app process

01.12.2021

Modification in the instruction for CORE approved re rollers regarding "IR" marking.

ELCORE/MP/Vendor app process

01.12.2021

Clarification regarding Stage inspection for items procured from BIS licensed Suppliers/ manufacturers.

ELCORE/MP/Vendor Confidential/2018 Pt-I

20.11.2021

Quality measures of fabrication and galvanization of steel.

RDSO-TI0LKO(OHE)/62/2020-O/oPED/TI/RDSO

19.11.2021

Development of Current Carrying Dropper Fittings as per RDSO Specification No. TI/SPC/OHE/Fittings/0130(10/13) Rev 1

ELCORE/MP/PSI/21/1

11.11.2021

Change of RDSO Specification for Low Tension Distribution Panel for TSS, SP & SSP

Railway Board’s letter No.2003/Elect(G)/161/I/Vol-III/Pt.

29.10.2021

Proposal for shifting of Capacitor, Three Pulley Regulating Equipment 2400 kgf, SS Wire Rope and 25 kV Motorised Isolator

ELCORE/MP/PSI/21/1

27.08.2021

Modification of specification as per latest RDSO specification/ drawing of CT &PT.

ELCORE/MP/Vendor/Misc-Pt.II

09.08.2021

Development of CT, PT and Isolators for 2x25kV New System to be used for 160 kmph.

Railway Board’s letter No.2003/RS(G)/774/4

26.06.2021

Uniformity of Technical eligibility criteria for Procurement

TIOLKO(PSIV80/202

22.06.2021

Revised specification of Single Phase Traction Power Transformer

ELCORE/MP/Steel Policy/Pt.III

21.05.2021

Weight of Galvanization for different OHE structures.

ELCORE/MP/Steel policy/pt-III

17.02.2021

Weight of Galvanization for different OHE Structures.

TI/OHE/CW/POLICY/20

06.01.2021

Copy of Revised Specification and STR

Year-2020

TI/OHE/FEEDER/POLICY/2

18.12.2020

Revised Specification no. TI/SPC/OHE/HDCSCF/0031 for Hard Drawn Stranded Copper Conductor.

ELCORE/T/OHE/Policy/Pt.XVI

19.11.2020

Utilisation of material available in Railway Stock.

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Letter of Acceptance (LOA) of recently awarded contracts for OHE & PSI Works by CORE for Vendors’ information (January-2020 to March-2020)

ElCORE/MP/Vendor/Confidential/20 1 8

11.11.2020

Revised instructions for marking, weighments & inspection process for Galvanized Steel Structurers (GSS)

ELCORE/MP/Steel policy/Pt-II

29.10.2020

Weight of Galvanization for different OHE Structures.

ELCORE/ALD/MP/Vendor/Policy/Pt.II

07.08.2020

System improvement regarding consignee inspection of items with purchase order more than 5 lacs (the value below which RITES is not conducting inspection).

CORE-HQ-ELETRICAL/ELCORE-OHE-TSS-GR-307/01119900019489

26.05.2020

Letter of Acceptance (LOA) of recently awarded contracts for OHE & PSI Works by CORE

CORE/S/Scrap Policy/12

22.04.2020

Disposal of copper cut pieces scrap available in RE Projects

ELCORE/MP/Vendor app.Process

24.01.2020

Supply of angles, channels, flats & rounds for fabrication of Galvanized Steel Structures for OHE & TSS.

TI/OHE/FTGFE/19 (Pt fl)

30.01.2020

Modification in drawing of Raised Register Arm Clamp (ETI/OHE/P/1370-1) & Feeder Ending Clamp (150) (ETI/OHE/P/1130)

Year-2019

TI/OHE/FTGFE/18/04

06.06.2019

Revision of Raised Register Arm Clamp drawing No. ETI/OHE/P/1370-1 Rev H and ETI/OHE/P/1370-2 Rev B.

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Letter of Acceptance (LOA) of recently awarded contracts for OHE & PSI Works by CORE for Vendors’ information up to Dec’2019

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Details of OHE/Composite Electrical Works awarded from April-2018 to July-2019

Year-2011

ELCORE/MP/Steel/Policy /Pt.II

14.02.2011

Diversion of Materials required for Electrical works from Projects-reiteration of the guideline