Wales has a comprehensive railway network that connects various regions of the country. The main railway lines operating in Wales include:

1. North-South Wales Line: This is a significant route that connects the north and south of Wales, running from Holyhead in the north to Cardiff in the south. It serves key cities such as Llandudno, Bangor, Wrexham, and Newport.

2. Cambrian Line: This scenic line runs from Shrewsbury to Aberystwyth and Pwllheli, passing through beautiful landscapes in Mid Wales. It is known for its picturesque views along the coast and through the mountains.

3. Heart of Wales Line: This line operates between Swansea and Shrewsbury, traversing the rural heart of Wales. It serves towns such as Llandeilo, Llandovery, and Builth Wells.

4. Cardiff to Manchester Line: This line connects Cardiff with Manchester, providing an essential link for passengers traveling between Wales and England.

5. Valley Lines: This network of local rail services operates around Cardiff and the surrounding valleys, connecting smaller towns and communities to the capital.

6. Brecon Mountain Railway: Although more of a heritage line, it offers scenic rides and is a popular tourist attraction in the Brecon Beacons area.

7. West Wales Line: This line connects Swansea to Fishguard and Pembroke Dock, serving the western coastal regions of Wales.

These lines are operated by various train companies, with Transport for Wales being the primary operator for the majority of services within the country. The railway network plays a crucial role in facilitating travel and commerce, as well as promoting tourism in Wales.

For further details and updates on train services, you can visit the official Transport for Wales website: Transport for Wales.