Scenic Train To North Wales

If this is from some RS output it will mean the Bath to Conwy train (changing at Newport (Gwent) for the long distance train to Conwy.

Thanks.

I plan on staying a few nights in Bath and probably visit Cardiff as a day trip.
After that I plan to travel to North Wales. If there is a scenic train ride, I plan to take that.

I also saw that there is a faster train from Cardiff to Conwy but is that one as scenic as the Bath to Conwy train?

There is only one sensible route from Cardiff (where the train comes from before the Newport call, it'll have started several hours earlier at one of several places in West Wales).
The only other all rail route is the Heart of Wales line, but you would have to go further west to Swansea to catch that. There are only a handful of trains a day, it's about 4 hours from Swansea to Shrewsbury, then change at Shrewsbury for Conwy.
I think that is an incredibly beautiful line, but it is a full day expedition, and it's not in the RS tool kit of lines to cover, so leave it at that.
There are various other partly bus options you could take, but they are all very long winded. some take over a day to do.

On your Great Britain Itinerary

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Bath to Conwy involves first going to Newport (a 15 minute train ride east of Cardiff). Whether you go from Bath or Cardiff to Conwy, the route going north from Newport will be exactly the same = The Welsh Marches Line which roughly follows the England - Wales border to Chester. The line is scenic mainly going through lush farming country with some hilly bits thrown in.

As direct trains go from Cardiff to Conwy in north Wales and Cardiff has plenty of sites of interest to tourists including 4 castles (Cardiff, St.Fagans and just to the north Caerphilly and Castell Coch) it makes more sense to stay in Cardiff for maybe 2 nights rather than do it as a day trip from Bath and then have to get back to Newport again in order to travel north.

Understood about the "your" Nigel.
I could have worded it better.

I now plan on staying at least 1 night in Cardiff and taking the train from there.

Thanks for everyone's help.

If you are going to St. Fagans Castle & museum of buildings - plus gardens, you will need at least half a day as the site is vast. Cardiff Bus 32 from Westgate Street (stadium side) - takes about 25 minutes for journey.https://museum.wales/stfagans/buildings/castle/

For Caerphilly Castle - it is best to use a local train (every 15 minutes usually) and the journey takes about 25 m minutes from Cardiff Central - usually platform 6. https://cadw.gov.wales/visit/places-to-visit/caerphilly-castle

Cardiff Bay is 1 mile south of the city centre.