--- title: "Core Valley Lines - Caerphilly Tunnel Ground Investigation" ocid: "ocds-kuma6s-159101" canonical_url: "https://d3tenders.com/contract/?ocid=ocds-kuma6s-159101" markdown_url: "https://d3tenders.com/contract/ocds-kuma6s-159101.md" json_url: "https://d3tenders.com/contract/ocds-kuma6s-159101.json" source: "Sell2Wales" current_stage: "Tender" buyer: "SEILWAITH AMEY CYMRU / AMEY INFRASTRUCTURE WALES LIMITED" published: "2025-12-09" --- # Core Valley Lines - Caerphilly Tunnel Ground Investigation Buyer: SEILWAITH AMEY CYMRU / AMEY INFRASTRUCTURE WALES LIMITED Current stage: Tender OCID: ocds-kuma6s-159101 [View canonical contract page](https://d3tenders.com/contract/?ocid=ocds-kuma6s-159101) [Download OCDS JSON](https://d3tenders.com/contract/ocds-kuma6s-159101.json) ## Summary Seilwaith Amey Cymru / Amey Infrastructure Wales Limited, based in Pontypridd, is spearheading a public procurement process titled "Core Valley Lines - Caerphilly Tunnel Ground Investigation". This project, under the umbrella of Transport for Wales, aims to assess the track formation condition through the Caerphilly tunnel, situated on the Cardiff to Rhymney line. The procurement falls under the "works" category and involves ground investigation and railway construction. The current stage of this open procurement is 'Tender', with submissions expected by 5th January 2026. Relevant documentation for the tender was published on 9th December 2025. The procurement is suitable for consortia bids and requires compliance with eligibility criteria including ConstructionLine Gold and RISQS memberships. This tender represents a significant opportunity for businesses involved in ground investigation and railway construction, particularly those with a background in tunnel and railway maintenance. The scope includes various sophisticated tasks such as automatic ballast sampling, laboratory analysis, and comprehensive reporting–skills that specialised contractors in these fields are well-positioned to fulfil. Companies with expertise in handling large-scale infrastructure projects and possessing the necessary safety and quality accreditations would find this tender particularly advantageous. The duration of the project alongside potential future maintenance work offers extensive opportunities for business growth and expansion within the railway industry sector in Wales. ## Notice Transport for Wales (TfW) have instructed Amey Infrastructure Wales (AIW) to undertake an assessment of the condition of the track formation through Caerphilly tunnel due to historic ponding of waters within the tunnel.The tunnel is located on the Cardiff to Rhymney line (CAR) between 6m06ch and 7m12ch with a length of 1,731m.Contractors are required to undertake the following works:1.Undertake all investigation works to NR/L2/TRK/4239.2.Prepare risk assessments and task briefs for the works.3.Provide a welfare unit for the works.4.Provide security to the compound during out of hours, if required by the contractor.5.Provide trolleys for transporting materials/plant to the place of works.6.Undertake Automatic Ballast Sampling (ABS) to rock head (assume 1m depth) at 25m centres in both the up and down road. Sampling at both tunnel portals to be undertaken7.Obtain laboratory analysis of the samples for the extent of silts within the track formation.8.Backfill sampling locations with a sand / cement mix, plus 200mm of ballast under bottom of sleeper, as defined in NR/L2/TRK/4239.9.Prepare a factual report.NOTE: To register your interest in this notice and obtain any additional information please visit the Sell2Wales Web Site at https://www.sell2wales.gov.wales/Search/Search_Switch.aspx?ID=159101.The buyer has indicated that it will accept electronic responses to this notice via the Postbox facility. A user guide is available at https://www.sell2wales.gov.wales/sitehelp/help_guides.aspx.Suppliers are advised to allow adequate time for uploading documents and to dispatch the electronic response well in advance of the closing time to avoid any last minute problems. (WA Ref:159101)The buyer considers that this contract is suitable for consortia bidding. ## Key Details | Field | Value | | --- | --- | | Publication source | Sell2Wales | | Latest notice | https://www.sell2wales.gov.wales/search/search_switch.aspx?ID=159101 | | Notice type | S2W Notice - Website Invitation to Tender Notice | | Procurement type | Standard | | Procurement category | Works | | Procurement method | Open | | Procurement method details | Not specified | | Tender suitability | Not specified | | Awardee scale | Not specified | | All stages | Tender | ## Dates | Field | Value | | --- | --- | | Publication date | 9 Dec 2025 | | Submission deadline | 5 Jan 2026 | | Future notice date | Not specified | | Award date | Not specified | | Contract period | Not specified | | 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 | Not specified | | Lots status | Not specified | | Awards status | Not specified | | Contracts status | Not specified | ## Buyer | Field | Value | | --- | --- | | Main buyer | SEILWAITH AMEY CYMRU / AMEY INFRASTRUCTURE WALES LIMITED | | Locality | PONTYPRIDD | | Post town | Not specified | | Postcode | N/A | | Country | Not specified | | ITL 1 | Not specified | | ITL 2 | Not specified | | ITL 3 | Not specified | | Local authority | Not specified | | Electoral ward | Not specified | | Westminster constituency | Not specified | | Delivery location | Not specified | ## CPV Codes ### Divisions - 45 - Construction work - 50 - Repair and maintenance services ### Codes - 45111250 - Ground investigation work - 45221242 - Railway tunnel construction work - 45234100 - Railway construction works - 50200000 - Repair, maintenance and associated services related to aircraft, railways, roads and marine equipment - 50220000 - Repair, maintenance and associated services related to railways and other equipment ## Release History - 9 Dec 2025 at 10:39 - Tender - S2W Notice - Website Invitation to Tender Notice - https://www.sell2wales.gov.wales/search/search_switch.aspx?ID=159101 ## Notice URLs - http://amey.co.uk - https://www.sell2wales.gov.wales/ - https://www.sell2wales.gov.wales/Search/Search_Switch.aspx?ID=159101.The - https://www.sell2wales.gov.wales/sitehelp/help_guides.aspx.Suppliers ## 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-kuma6s-159101. The underlying structured data is available as OCDS JSON at https://d3tenders.com/contract/ocds-kuma6s-159101.json.