Mark Langman, Network Rail route managing director for Wales, said there was 'potential for quicker and more frequent journeys on a network that is more resilient and reliable' in future.
He was speaking as the organisation set out plans for investing £1billion in the rail system.
This is an exciting time for the railway. We are now carrying a record number of people on record numbers of trains at record levels of reliability. This is an ambitious plan that will help move the railway in Wales to the next level.
More top news
The Welsh Government will later launch new plans to reduce the number of children living in poverty in Wales.
Plaid Cymru are to launch their campaign this morning ahead of May's general election.
A study by Swansea University has found a fifth of students in the UK have considered working in the sex industry to fund their studies.