We’re developing proposals to improve the South Wales Mainline as part of our long-term plan to improve rail services across South Wales, including better connections to the South East and South West England.  

We're working with Network Rail, Department for Transport and Welsh Government to secure mainline capacity and capability improvements which will mean faster, more frequent rail services as well as provide for freight services.

Planned capacity and capability improvements will mean faster, more frequent rail services as well as freight services.


Our immediate priorities: 


In the period up to 2029, we aim to: 

  • Introduce new, direct long-distance services between West Wales, Cardiff and Bristol to strengthen regional connectivity and reduce the need to change trains.  
  • Open five new stations and frequent stopping- services between Cardiff, Newport and Bristol recommended by Lord Burns and the South East Wales Transport Commission as part of the ‘Network of Alternatives’ to travel on the M4.  
  • Improve the frequency of the local stopping-service between Cardiff and Swansea and open  new stations.  
  • Improve overall journey times by increasing line speeds where feasible, including smaller-scale measures under a ‘quick wins’ programme. 
  • Solve passenger and freight services bottlenecks.   
  • Extend line electrification - initially from Cardiff to Swansea - to reduce carbonisation of passenger and freight services. 


Longer-term projects: 


Longer-term, we’ll continue electrifying the rail network in South West Wales to decarbonise and reduce the environmental impact of passenger and freight trains.  We’ll also support further electrification in the South West of England to Bristol Temple Meads,  allowing more electric trains in Wales and reducing overall journey times.   

As part of our long-term plan we’ll undertake work to safeguard the South Wales Mainline from the effects of climate change. 


South Wales Mainline: emerging priorities and longer term projects