Merlins Bridge railway bridge replacements

A £4.25m upgrade project will replace two railway bridges in Pembrokeshire in 2019.

We will be replacing Pembroke Road railway bridge (which crosses Pembroke Road) and Milford Road railway bridge (which crosses the A4076 on Dredgeman Hill) both set in Merlins Bridge, Haverfordwest. The upgrade project is part of our Railway Upgrade Plan and will improve the resilience and reliability of the railway for passengers.

Image 1: Pembroke Road railway bridge                                                                                         

Image 2: Milford Road railway bridge                                                                                      

Both railway bridges, which carry the South Wales Mainline, require this essential work as part of our commitment to maintain a safe and reliable railway. Milford Road underbridge was last reconstructed in 1939. Pembroke Road underbridge was originally built in 1856 and the bridge deck was last reconstructed in 1937, and so both bridges are coming toward the end of their lifespan.

Alongside us, the primary contractor on site will be AMCO.

During the core weekends of work at each bridge we will be:

  • removing the rail track bed
  • demolishing and removing the existing bridge deck and returning it to the compound
  • transporting the new bridge to site and fixing it in place
  • completing drainage and waterproofing
  • reinstating the rail track bed
  • completing essential safety checks.

Pembroke Road railway bridge

Following the successful completion of the Pembroke Road rail bridge renewal, Pembroke Road has now re-opened and train services between Whitland and Milford Haven have resumed as normal. We demolished and removed the existing bridge deck and installed a new steel  structure, which includes a concrete collision beam to provide extra resilience.

The replaced Pembroke Road railway bridge

Single lane traffic management

To complete all our finishing works a single lane traffic management system will also be in operation on Pembroke Road, at the bridge, from 22:00 on Saturday 26 January to 10:00 on Sunday 27 January and from 22:00 on Saturday 2 February to 10:00 on Sunday 3 February.

Changes to rail services for passengers

We are working in partnership with TfW Rail Services to minimise disruption during this upgrade work and a bus replacement service will be in operation between Whitland and Milford Haven for rail passengers on Saturday 19 January and Sunday 20 January. Passengers are advised to check before they travel at


Milford Road railway bridge

The core work to replace Milford Road railway bridge will take place from 19:00 on Friday 15 February until 06:00 on Monday 18 February. The A4076 at Milford Road railway bridge will be fully closed during this time and there will be a shuttle bus in operation to transport pedestrians and cyclists from one side of the bridge to the other. A full diversionary route will be in place for motorists.

The main site compound for our work on Milford Road will be located at the existing builders yard on Dredgemans Hill. Site set up commenced in January and we will have a presence on site until Spring 2019.

Drop-in events

We hosted the first of a series of drop-in events on Tuesday 4 December at the Merlins Bridge Welfare Hall (village hall), Pembroke Road, SA61 1JW.

Two further upcoming events have been arranged for the local community to find out more about this essential upgrade project. They will be hosted at Merlins Bridge Welfare Hall (village hall), Pembroke Road, SA611JW on:

  • Thursday 31 January from 15:00 -18:00

No appointment is necessary and representatives from Network Rail’s project team will be on hand to provide information and answer questions.

Contact us

For any comments or questions regarding the project, please contact our 24-hr Network Rail national helpline on 03457 11 41 41 or email us