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Data Transmission Network (DTN) HS2

Siemens Mobility Ltd

This public procurement record has 1 release in its history.

Tender

25 Aug 2026 at 08:40

Tender Notice
Summary of the contracting process

Siemens Mobility Ltd is procuring the Data Transmission Network for HS2, a telecommunications network supporting the reliable operation of HS2 trains and connected rail systems. The scope includes separate critical and protected networks for safety-related and non-safety-related subsystems; a secure, geographically redundant external interface and demilitarised zone for internet, cloud and Network Rail connectivity; central compute and servers; and internal and external security perimeters. It also includes a master clock system using Precision Time Protocol, boundary clock functionality, Synchronous Ethernet and Network Time Protocol. Other network services include DHCP, DNS, AAA authentication and network management for supplied operational systems, together with optical and electrical SFPs where required. Delivery covers the United Kingdom, Europe, the Channel Islands, the Isle of Man, British Overseas Territories and the rest of the world.

The process reached tender: Siemens Mobility Ltd invited suppliers to submit offers. The submission deadline set by the buyer is 7 September 2026 at 17:00 British Summer Time. The contract is scheduled to run from 5 April 2027 to 1 April 2033. Its estimated value is between £5 million and £10 million, inclusive of the stated minimum and maximum estimates. The procurement is for goods, classified as a telecommunications network. The requirement is presented as a single procurement covering the HS2 Data Transmission Network and its associated services and equipment. Evaluation will concern the offer against the technical and operational requirements for the network, its security, connectivity, timing, central services and interconnection equipment.

This opportunity suits network infrastructure providers, telecommunications specialists and rail technology businesses able to design, supply and support resilient operational networks. Relevant capability includes safety-related and protected network architecture, secure demilitarised zones, geographic redundancy, central compute and server environments, and secure connections to external cloud, internet and conventional rail systems. Suppliers should be able to provide and integrate master clock technology using Precision Time Protocol, boundary clocks, Synchronous Ethernet and Network Time Protocol. Experience with core network services such as DHCP, DNS, AAA authentication and network management systems will be valuable, as will the ability to supply optical and electrical SFPs and integrate connected operational subsystems. The procurement is identified as suitable for small and medium-sized enterprises, making consortium or specialist delivery models potentially relevant.

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Notice Information

Notice Title

Data Transmission Network (DTN) HS2

Notice Description

The HS2 Data Transmission Network (DTN) will provide network transport services and specific central service functions necessary for the reliable operation of trains on HS2. The DTN shall fulfil the following high-level requirements: * Provision of a Critical network for safety-related connected sub-systems: DTN-Critical * Provision of a Protected network (DTN-P), distinct from the critical DTN network, connecting non-safety-related subsystems. * Provision of a secure, geo-redundant external interface via a De-Militarized Zone (DMZ). DTN acts as the aggregator for internet and cloud connectivity from its DMZ. The DTN DMZ also acts as the interface to Network Rail to connect HS2 rail systems to Conventional Rail services hosted in Network Rail's telecoms network. * Provision of the DMZ, including central compute and servers, protected by internal and external security perimeters. * Provision of a Master Clock System, providing accurate clocking internally and to connected subsystems with Precision Time Protocol (PTP) with boundary clock functionality, Synchronous Ethernet (SyncE), and Network Time Protocol (NTP). * Provision of other services include: DHCP, DNS, AAA authentication, Network Management System (NMS) for supplied operational systems. * Provision of optical and electrical SFP (where required) to facilitate the above inter-connectivity.

Notice Details

Publication & Lifecycle

Open Contracting ID
ocds-b5fd17-de55b6fb-d7b1-4fe1-8984-7010e2a87c8b
Publication Source
Contracts Finder
Latest Notice
https://www.contractsfinder.service.gov.uk/Notice/16926aa2-bb03-4ff3-ba8f-75d82d69ca36
Current Stage
Tender
All Stages
Tender

Procurement Classification

Notice Type
Tender Notice
Procurement Type
Standard
Procurement Category
Goods
Procurement Method
Not Specified
Procurement Method Details
Tender Suitability
SME
Awardee Scale
Not specified

Common Procurement Vocabulary (CPV)

CPV Divisions

32 - Radio, television, communication, telecommunication and related equipment

CPV Codes

32412100 - Telecommunications network

Notice Value(s)

Tender Value
£10,000,000 £10M-£100M
Lots Value
Not specified
Awards Value
Not specified
Contracts Value
Not specified

Notice Dates

Publication Date
25 Aug 20262 days ago
Submission Deadline
7 Sep 20262 weeks to go
Future Notice Date
Not specified
Award Date
Not specified
Contract Period
5 Apr 2027 - 1 Apr 2033 Over 5 years
Recurrence
Not specified

Notice Status

Tender Status
Active
Lots Status
Not Specified
Awards Status
Not Specified
Contracts Status
Not Specified

Buyer & Supplier

Contracting Authority (Buyer)

Main Buyer
Siemens Mobility Ltd
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
NW1 2PL
Postcode Area
North West London
Country
England
Major Region (ITL 1)
TLI London
Basic Region (ITL 2)
TLI3 Inner London - West
Small Region (ITL 3)
TLI36 Camden
Delivery Location
Not specified
Local Authority
Camden
Electoral Ward
Regent's Park
Westminster Constituency
Holborn and St Pancras

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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