Jim Champ's "Introduction to Great Western Locomotive Development"

This is the full on Swindon version of the F class, with the Barry boiler replaced by a Standard 9, and of course pannier tanks. This sketch is based on GWR diagram B60, and its interesting that the inside frame profile on that drawing is different from the other GWR and Barry diagrams. Its difficult to work out this kind of detail in photographs where the frames are in shadows, but I have a suspicion this style of frame may be associated with at least some of the later lots. I do need to say that although I've given the sketch a cabside number of 780, I do not actually know which style of frames 780 was fitted with.