The Western Gateway 2050 Rail Vision promotes increasing capacity to allow up to four trains per hour between Bristol and Cardiff, reducing journey times between the cities from 50 to 30 minutes. It also suggests that journey times between Swansea and Bristol could be dramatically reduced from one and a half hours once an hour to 60 minutes with three trains an hour, through funding Transport for Wales proposed improvements to the South Wales Main Line and upgrading the Severn crossing.
The plans estimate that improvements would cost between £1-2bn in the short term to deliver already committed and planned developments up to 2035. In the long term, the full range of development up to 2050 has been estimated to cost a further £7-8bn.