Arriva Trains Wales says it's extending its mobile ticketing system across the country after a successful trial on the Cardiff and Valleys network.
It says customers can make savings using Mobile Multi-flex ticket - the first mobile ticketing system of its kind in the UK.
Tickets can be bought, through an app, to travel between any two places and can be stored on a smartphone for up to three months after the date of purchase.
A signalling problem at Abercynon means trains are unable to run between Pontypridd and Aberdare / Merthyr Tydfil.
Buses will replace trains between these stations, extending journey times by up to 30 minutes.
This is expected to last until 07:30.
There are possible delays on Arriva Trains Wales at Betws-y-Coed because of sheep on the line.
Arriva Trains Wales says, from today, it's tripling the number of services from North Wales to Manchester Airport.
It means there will be 57 services a week.
The company says Manchester Airport is already an extremely popular airport for Welsh travellers with more Welsh residents flying from Manchester than any other airport – including Heathrow.
There are delays on Arriva Trains Wales between Criccieth and Porthmadog because of a problem with lineside equipment.
There are delays of around 15 minutes on Arriva Trains Wales between Treherbert and Pontypridd because of signalling problems.
There are delays of up to 15 minutes and cancellations on Arriva Trains Wales between Rhymney and Tir-Phil because of over running engineering works.
There's a replacement bus service running on Arriva Trains Wales between Bridgend and Barry because of points failure.
Network Rail says the Conwy Valley line will reopen today a week ahead of schedule.
The line was severely damaged following flooding in late December. Network Rail says engineers and contractors repaired over 100 separate locations of damage along the line from Llandudno Junction to Blaenau Ffestiniog.
Arriva Trains Wales says from today a special timetable will operate with nine services operated by train and the remaining three service operated by bus. It hopes to resume a full rail service soon.
There's a replacement bus service running on Arriva Trains Wales between Llandudno Junction and Blaenau Ffestiniog because of flooding.