So far, 197029+197035 have run to Aberystwyth on the Aberystwyth night, but they turned back at Harlech on the first Pwllheli night.
Hopefully, as tests and measurements progress, that'll save time and they'll be able to run further North on the second and third Pwllheli nights.
Edit: Something really strange has happened. Even though 197029+197035 turned back at Harlech, Realtime Trains (RTT) is showing that they went on to Pwllheli, but they definitely turned back at Harlech, as 1) I saw it happen on the OpenTrainTimes Cambrian map, and 2) they didn't go through Porthmadog, where I was all night. I've never ever seen anything like this - does anyone know the (likely) reason that RTT is showing these particular false reports? Maybe you know,
@Tom? RTT is great, but this is utterly baffling.