Now, this is a very, very, sweeping generalisation so give me a bit of wobble room with it, guys, but the rule seemed to be that the GWR's lines in South Wales that dated from before the grouping used locos that had not been specifically designed for South Wales work but were Churchward standards such as 45xx, 42xx, 5101, and their varinats, with 43xx and 28xx on the Pontypool-Neath route (later cameo appearances of Stanier 8F and Austerity 8F), backed up by the usual pannier suspects, whereas lines acquired at the grouping, TVR, RR, B&M, R&SB etc tended to accumulate 56xx and 64xx which were Swindon's post 1923 specific response to South Walian conditions as their native 0-6-2s were thinned out. The 94xx fits into this scene as part of Swindon's long ongoing programme of replacing Welsh museum pieces with modern locos made of Swindon standard parts; they were at least partly intended to replace the likes of TVR 04 and some of the Alexandra Dock sort of exotica.
Please note the use of terms such as 'generalisation', 'seemed', or 'tended'; this is not a hard or fast rule, and is well proven by the large number of exceptions. For instance, the R & SB were supplied with 3 brand new 45xx small prairies from Swindon, painted in their very smart dark red livery, and 're-absorbed' fairly seamlessly into GW stock in 1923. In a similar vein, the Barry Railway borrowed several brand new large prairies, which were IIRC similarly re-absorbed in 1923, in order to have loco with water capacity to work through from Cardiff (Riverside) to Bridgend via their Vale of Glamorgan route.
Note the use of corridor coaches in Budgie's not that dreadful and actually very informative photo in post 70; Pontypool-Neath through trains took more than 2 hours to complete their journey, and were thus provided with main line stock that had toilet facilities and corridor connections. This also applied to Newport-Brecon trains, which might turn up behind a 2251 or Ivatt 2MT mogul, but were often hauled by 57xx/8750 panniers, not normally locos associated with main line stock on runs of over 2 hours. This was not the cascaded Edwardian time served fare you'd expect, but quite new Collett and Hawksworth stuff. Brand new Hawksworth all-steel auto trailers, still being built in the early 50s, could be seen alongside matchboarded ones that had begun life as steam railmotors 40+ years earlier South Wales is different!
Edited by The Johnster, 03 July 2017 - 16:02 .