66208 has its work cut out with this heavy train of 25 BDA flats each loaded with three steel slabs heading for the plant at Llanwern. It has come from Margam steel works, 6H25 0953 off.
Due to the previous steel train running on the Up Relief, 66102 is routed along the Up Main with a rake of empty HAA coal hoppers. It could be 6C55 Aberthaw to Avonmouth empty MGR running as a class 6 rather than a class 4 due to the type of wagons.
Moving on to Pont Tal Y Bont to the west of Cardiff at the west end of Miskin loops. An unknown HST passes over the bridge over the Ely River with 1B25 1045 Paddington to Swansea.