... Welsh Gold?
** Although First Cymru have "no forthcoming timetables", it is possible to find some forthcoming timetables via "Travel News" and "Service Updates". Here, fbb's supposition is confirmed; the X13 is increased to every 20 minutes between Swansea and Ammanford. Peak time journeys to Llandeilo continue and the X14 variant is withdrawn.
Well guessed, fbb?