---
title: "3rd Line Support for the Maintenance of the London Overground WestCAD & SSI Interlocking"
ocid: "ocds-h6vhtk-0506f8"
canonical_url: "https://d3tenders.com/contract/?ocid=ocds-h6vhtk-0506f8"
markdown_url: "https://d3tenders.com/contract/ocds-h6vhtk-0506f8.md"
json_url: "https://d3tenders.com/contract/ocds-h6vhtk-0506f8.json"
source: "Find A Tender Service"
current_stage: "Award"
buyer: "TRANSPORT FOR LONDON"
published: "2025-04-24"
---

# 3rd Line Support for the Maintenance of the London Overground WestCAD & SSI Interlocking

Buyer: TRANSPORT FOR LONDON  
Current stage: Award  
OCID: ocds-h6vhtk-0506f8

[View canonical contract page](https://d3tenders.com/contract/?ocid=ocds-h6vhtk-0506f8)  
[Download OCDS JSON](https://d3tenders.com/contract/ocds-h6vhtk-0506f8.json)

## Summary

The contract for "3rd Line Support for the Maintenance of the London Overground WestCAD & SSI Interlocking" was awarded by Transport for London. This procurement falls under the services category and involves Siemens Mobility Limited as the supplier. The procurement is specific to repair and maintenance services within the transport industry, taking place across multiple UK regions, including London. The procurement method used was direct, with specific details noting it was below threshold and without competition, primarily focusing on utilities. The contract is set to run from 24th April 2025 and conclude on 31st July 2026.

This tender provides significant opportunities for large-scale businesses, particularly those experienced in complex signalling control systems, like Siemens Mobility Limited, who are well-placed to manage ongoing and future maintenance requirements. Businesses with a strong technical support infrastructure and the capability to provide 24/7 diagnostic and maintenance services can benefit from such contracts. It highlights potential business growth avenues for companies keen on entering or expanding within the UK's transport and utilities service sectors.

## Notice

This is a single source for the Third line support and maintenance contract for the WestCAD signalling control and display system (SCDS) and the Solid-State Interlocking (SSI) which were developed by and installed by Siemens Mobility Limited for signalling control on the London Overground Core Windrush Line (formerly East London Line). The contract will end on the 31st July 2026. This contract undertakes 3rd line support should faults not be rectified locally across the line. Siemens provide a 24/7 diagnostic hotline, all operational spares, escalation of fault to expert if unable to resolve and the availability of system experts in hardware/software. This is estimated to cost during this period is PS135,000 (excluding VAT).

## Key Details

| Field | Value |
| --- | --- |
| Publication source | Find A Tender Service |
| Latest notice | https://www.find-tender.service.gov.uk/Notice/016771-2025 |
| Notice type | UK5 - Transparency Notice |
| Procurement type | Standard |
| Procurement category | Services |
| Procurement method | Direct |
| Procurement method details | Below threshold - without competition |
| Tender suitability | Not specified |
| Awardee scale | Large |
| All stages | Award |

## Dates

| Field | Value |
| --- | --- |
| Publication date | 24 Apr 2025 |
| Submission deadline | Not specified |
| Future notice date | Not specified |
| Award date | 24 Apr 2025 |
| Contract period | 23 Apr 2025 - 31 Jul 2026 |
| Recurrence | Not specified |

## Values

| Field | Value |
| --- | --- |
| Tender value | Not specified |
| Lots value | Not specified |
| Awards value | £135,000 |
| Contracts value | Not specified |

## Status

| Field | Value |
| --- | --- |
| Tender status | Complete |
| Lots status | Complete |
| Awards status | Pending |
| 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 | Not specified |

## Supplier

| Field | Value |
| --- | --- |
| Number of suppliers | 1 |
| Supplier names | SIEMENS MOBILITY |

## CPV Codes

### Divisions

- 50 - Repair and maintenance services

### Codes

- 50000000 - Repair and maintenance services

## Release History

- 24 Apr 2025 at 12:10 - Award - UK5 - Transparency Notice - https://www.find-tender.service.gov.uk/Notice/016771-2025

## Documents

- https://www.find-tender.service.gov.uk/Notice/016771-2025
  24th April 2025 - Transparency notice on Find a Tender

## Notice URLs

- https://www.legislation.gov.uk/ukpga/2023/54/contents
- https://www.mobility.siemens.com/uk/en.html

## 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-0506f8. The underlying structured data is available as OCDS JSON at https://d3tenders.com/contract/ocds-h6vhtk-0506f8.json.