I am going to Cardiff next week and I am going to sample the 231 for the first time so I will appreciate it if someone could find/share the diagrams for me please so I know where they run and what times they run.
RTT today had it running as follows. I've included Cardiff Central times as that is where most people not living on the line would pick it up)
Entered service at Cardiff Central
2P00 0546 Cardiff Central to Penarth
2D00 0602 Penarth to Bargoed (Cardiff central 0616)
2P09 0702 bargoed to Penarth (Cardiff central 0744)
2R02 0803 Penarth to Rhymney (CC 0816)
2P31 0927 Rhynmney to penarth (CC 1032)
2D26 1048 Penarth to Bargoed (CC 1101) (because of late running this terminated at Caerphilly today)
2P47 1200 Bargoed to Penarth (CC 1246) (today started at Caerphilly)
2R12 1303 Penarth to Rhymney (CC1316)
2P67 1427 Rhymney to Penarth (CC 1532)
2F55 1548 Penarth to Cardiff Central (arr 1600)
As far as I can tell 231007 ran the same diagram yesterday and all last week