--- title: "London Overground Core Windrush Line Transmission Design and Build" ocid: "ocds-h6vhtk-051b27" canonical_url: "https://d3tenders.com/contract/?ocid=ocds-h6vhtk-051b27" markdown_url: "https://d3tenders.com/contract/ocds-h6vhtk-051b27.md" json_url: "https://d3tenders.com/contract/ocds-h6vhtk-051b27.json" source: "Find A Tender Service" current_stage: "Planning" buyer: "TRANSPORT FOR LONDON" published: "2026-04-17" --- # London Overground Core Windrush Line Transmission Design and Build Buyer: TRANSPORT FOR LONDON Current stage: Planning OCID: ocds-h6vhtk-051b27 [View canonical contract page](https://d3tenders.com/contract/?ocid=ocds-h6vhtk-051b27) [Download OCDS JSON](https://d3tenders.com/contract/ocds-h6vhtk-051b27.json) ## Summary Transport for London is seeking a contractor for the London Overground Core Windrush Line Transmission Design and Build project. This procurement process is classified under urban railway works in the construction industry. The project involves upgrading the transmission system and encompasses both design and build elements. The procurement stage is currently in the planning phase, aiming to release the Invitation to Tender (ITT) documents by mid-May 2026. Key dates include a future notice on 11th May 2026, with project implementation planned starting from 2nd November 2026. The contracting process has experienced delays, and engagement with potential contractors was scheduled for 1st October 2025. This tender offers substantial opportunities for businesses specialising in railway infrastructure and telecom systems due to the comprehensive scope, which includes transmission systems, telecommunication cabling, and UPS design and installation tasks. Companies with expertise in Commission, Design, Install, and Overhaul services in railway systems are well-suited to compete. Particularly, firms within the Greater London region or those with previous experience working with Network Rail are encouraged to express interest. The scheme is part of a strategic plan to enhance the urban railway infrastructure, allowing eligible enterprises to expand their footprint in the high-value utilities sector. ## Notice London Overground requires a contractor to upgrade the existing Transmission system installed on the Core Windrush Line. It is proposed that the successful contractor will undertake the both the design and build elements of the scheme. Further details will be provided within the MSQ documentation. ### Planning Information On the 30th June 2025, the Railway Industry Supplier Qualification Scheme (RISQS) was used to identify potential contractors to shortlist for participation in the formal procurement process expected to commence in December 2025. In order to do that the following Railway Industry Commodity Classification List (RICCL) codes were selected were: B.C.2.1.6: Lineside Telephones / Commission + Design + Install + Overhaul B.C.2.2.1: Transmission Systems / Commission + Design + Install + Overhaul B.C.2.2.6: Telecomm Cabling (Data Cabling) / Commission + Design + Install + Overhaul B.C.2.2.7: Telecomm Cabling (Fibre) / Commission + Design + Install + Overhaul B.C.2.2.8: UPS / Commission + Design + Install + Overhaul Audit CDM Scope: CDM Principal Contractor AND CDM Principal Designer, Infrastructures: Network Rail, Regions Greater London RISQS identified 13 contractors with the ability to undertake the works identified by London Overground. Market engagement will commence with these suppliers only. Further information about RISQS can be found below https://www.find-tender.service.gov.uk/Notice/007184-2025 A market sounding questionnaire will be issued for the 13 Contractors to complete, submit and express an interest in formally participating with the tender process later in 2025 or early 2026. ## Key Details | Field | Value | | --- | --- | | Publication source | Find A Tender Service | | Latest notice | https://www.find-tender.service.gov.uk/Notice/035304-2026 | | Notice type | UK2 - Preliminary Market Engagement Notice | | Procurement type | Standard | | Procurement category | Works | | Procurement method | Not Specified | | Procurement method details | Not specified | | Tender suitability | Not specified | | Awardee scale | Not specified | | All stages | Planning | ## Dates | Field | Value | | --- | --- | | Publication date | 17 Apr 2026 | | Submission deadline | Not specified | | Future notice date | 11 May 2026 | | Award date | Not specified | | Contract period | 2 Nov 2026 - 1 Jul 2028 | | Recurrence | Not specified | ## Values | Field | Value | | --- | --- | | Tender value | Not specified | | Lots value | Not specified | | Awards value | Not specified | | Contracts value | Not specified | ## Status | Field | Value | | --- | --- | | Tender status | Planned | | Lots status | Planned | | Awards status | Not specified | | Contracts status | Not specified | ## Buyer | Field | Value | | --- | --- | | Main buyer | TRANSPORT FOR LONDON | | Locality | LONDON | | Post town | East London | | Postcode | E20 1JN | | Country | England | | ITL 1 | TLI London | | ITL 2 | TLI4 Inner London - East | | ITL 3 | TLI41 Hackney and Newham | | Local authority | Newham | | Electoral ward | Stratford Olympic Park | | Westminster constituency | Stratford and Bow | | Delivery location | TLI London | ## CPV Codes ### Divisions - 45 - Construction work ### Codes - 45234120 - Urban railway works ## Release History - 17 Apr 2026 at 14:18 - PlanningUpdate - UK2 - Preliminary Market Engagement Notice - https://www.find-tender.service.gov.uk/Notice/035304-2026 - 21 Aug 2025 at 11:30 - Planning - UK2 - Preliminary Market Engagement Notice - https://www.find-tender.service.gov.uk/Notice/050505-2025 - 21 May 2025 at 13:47 - Planning - UK1 - Pipeline Notice - https://www.find-tender.service.gov.uk/Notice/024035-2025 ## Documents - https://www.find-tender.service.gov.uk/Notice/035304-2026 17th April 2026 - Preliminary market engagement notice on Find a Tender - https://www.find-tender.service.gov.uk/Notice/050505-2025 21st August 2025 - Preliminary market engagement notice on Find a Tender - https://www.find-tender.service.gov.uk/Notice/024035-2025 21st May 2025 - Pipeline notice on Find a Tender ## Notice URLs - https://www.find-tender.service.gov.uk/Notice/007184-2025 - https://www.legislation.gov.uk/ukpga/2023/54/contents ## Provenance This Markdown file is an alternate public rendering of the D3 Tenders contract record. The canonical page is https://d3tenders.com/contract/?ocid=ocds-h6vhtk-051b27. The underlying structured data is available as OCDS JSON at https://d3tenders.com/contract/ocds-h6vhtk-051b27.json.