--- title: "Data Transmission Network (DTN) HS2" ocid: "ocds-b5fd17-de55b6fb-d7b1-4fe1-8984-7010e2a87c8b" canonical_url: "https://d3tenders.com/contract/?ocid=ocds-b5fd17-de55b6fb-d7b1-4fe1-8984-7010e2a87c8b" markdown_url: "https://d3tenders.com/contract/ocds-b5fd17-de55b6fb-d7b1-4fe1-8984-7010e2a87c8b.md" json_url: "https://d3tenders.com/contract/ocds-b5fd17-de55b6fb-d7b1-4fe1-8984-7010e2a87c8b.json" source: "Contracts Finder" current_stage: "Tender" buyer: "Siemens Mobility Ltd" published: "2026-08-25" --- # Data Transmission Network (DTN) HS2 Buyer: Siemens Mobility Ltd Current stage: Tender OCID: ocds-b5fd17-de55b6fb-d7b1-4fe1-8984-7010e2a87c8b [View canonical contract page](https://d3tenders.com/contract/?ocid=ocds-b5fd17-de55b6fb-d7b1-4fe1-8984-7010e2a87c8b) [Download OCDS JSON](https://d3tenders.com/contract/ocds-b5fd17-de55b6fb-d7b1-4fe1-8984-7010e2a87c8b.json) ## Summary 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. ## Notice 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. ## Key Details | Field | Value | | --- | --- | | Publication source | Contracts Finder | | Latest notice | https://www.contractsfinder.service.gov.uk/Notice/16926aa2-bb03-4ff3-ba8f-75d82d69ca36 | | Notice type | Tender Notice | | Procurement type | Standard | | Procurement category | Goods | | Procurement method | Not Specified | | Procurement method details | Not specified | | Tender suitability | SME | | Awardee scale | Not specified | | All stages | Tender | ## Dates | Field | Value | | --- | --- | | Publication date | 25 Aug 2026 | | Submission deadline | 7 Sep 2026 | | Future notice date | Not specified | | Award date | Not specified | | Contract period | 5 Apr 2027 - 1 Apr 2033 | | Recurrence | Not specified | ## Values | Field | Value | | --- | --- | | Tender value | £10,000,000 | | Lots value | Not specified | | Awards value | Not specified | | Contracts value | Not specified | ## Status | Field | Value | | --- | --- | | Tender status | Active | | Lots status | Not specified | | Awards status | Not specified | | Contracts status | Not specified | ## Buyer | Field | Value | | --- | --- | | Main buyer | Siemens Mobility Ltd | | Locality | LONDON | | Postcode area | North West London | | Postcode | NW1 2PL | | Country | England | | ITL 1 | TLI London | | ITL 2 | TLI3 Inner London - West | | ITL 3 | TLI36 Camden | | Local authority | Camden | | Electoral ward | Regent's Park | | Westminster constituency | Holborn and St Pancras | | Delivery location | Not specified | ## CPV Codes ### Divisions - 32 - Radio, television, communication, telecommunication and related equipment ### Codes - 32412100 - Telecommunications network ## Release History - 25 Aug 2026 at 08:40 - Tender - Tender Notice - https://www.contractsfinder.service.gov.uk/Notice/16926aa2-bb03-4ff3-ba8f-75d82d69ca36 ## Documents - https://www.contractsfinder.service.gov.uk/Notice/16926aa2-bb03-4ff3-ba8f-75d82d69ca36 25th August 2026 - Opportunity notice on Contracts Finder - https://www.competefor.co.uk/business/viewOpportunityDetailsSupplier.html?id=117953053 Please follow this link to view the notice. ## Provenance This Markdown file is an alternate public rendering of the D3 Tenders contract record. 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