Planning

London Overground Core Windrush Line Transmission Design and Build

TRANSPORT FOR LONDON

This public procurement record has 3 releases in its history.

PlanningUpdate

17 Apr 2026 at 14:18

UK2 - Preliminary Market Engagement Notice
Planning

21 Aug 2025 at 11:30

UK2 - Preliminary Market Engagement Notice
Planning

21 May 2025 at 13:47

UK1 - Pipeline Notice
Summary of the contracting process

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.

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Notice Information

Notice Title

London Overground Core Windrush Line Transmission Design and Build

Notice Description

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.

Notice Details

Publication & Lifecycle

Open Contracting ID
ocds-h6vhtk-051b27
Publication Source
Find A Tender Service
Latest Notice
https://www.find-tender.service.gov.uk/Notice/035304-2026
Current Stage
Planning
All Stages
Planning

Procurement Classification

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

Common Procurement Vocabulary (CPV)

CPV Divisions

45 - Construction work

CPV Codes

45234120 - Urban railway works

Notice Value(s)

Tender Value
Not specified
Lots Value
Not specified
Awards Value
Not specified
Contracts Value
Not specified

Notice Dates

Publication Date
17 Apr 20261 weeks ago
Submission Deadline
Not specified
Future Notice Date
11 May 20263 weeks to go
Award Date
Not specified
Contract Period
2 Nov 2026 - 1 Jul 2028 1-2 years
Recurrence
Not specified

Notice Status

Tender Status
Planned
Lots Status
Planned
Awards Status
Not Specified
Contracts Status
Not Specified

Buyer & Supplier

Contracting Authority (Buyer)

Main Buyer
TRANSPORT FOR LONDON
Contact Name
Available with D3 Tenders Premium →
Contact Email
Available with D3 Tenders Premium →
Contact Phone
Available with D3 Tenders Premium →

Buyer Location

Locality
LONDON
Postcode
E20 1JN
Post Town
East London
Country
England
Major Region (ITL 1)
TLI London
Basic Region (ITL 2)
TLI4 Inner London - East
Small Region (ITL 3)
TLI41 Hackney and Newham
Delivery Location
TLI London
Local Authority
Newham
Electoral Ward
Stratford Olympic Park
Westminster Constituency
Stratford and Bow

Further Information

Notice Documents

Open Contracting Data Standard (OCDS)

View full OCDS Record for this contracting process

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The Open Contracting Data Standard (OCDS) is a framework designed to increase transparency and access to public procurement data in the public sector. It is widely used by governments and organisations worldwide to report on procurement processes and contracts. 

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