Whilst 98 may be on some form of special working, what is more likely is that it is working the last journey in from Pontypridd worked by Pontypridd on a week when they were operating the morning service, with Caerphilly operating in the afternoon. It would then return to Pontypridd out of service.
There is an interesting collection of classic prams outside the doctor’s surgery, but that building has been a veterinary surgery for over twenty years now.