After checking with Simon, I sent a hi-res copy of the Aberbeeg carriage photo to John Lewis (HMRS GWR Carriage Steward) for comment, his reply is quoted below:-
> 1/ date;
I had guessed 1958 because of the carriage liveries.
> 2/ carriage diagrams on view;
The suburban non-corridor ones of the two trains to the right are Collett, ones, most are apparently the earlier "high waist" style, but the rightmost one in crimson appears to have the later deeper windows. This one may be to Diagram C76 - see RC2 Pg 223, bottom picture. Its accompanying brake third may be of D117 - see RCA1 Fig 248. The 4 coach
train after it appears to have two brake thirds probably of D117, a third, behind the pannier's exhaust, which is probably a C66. Most interestingly is the following coach which appears to be a Diagram A15 all-first (see RCA1 Figs 22 and 23).
The train of main line stock is interesting because it is a mixture of LMS, BR and GWR coaches. The coach to the left of the 45xx tank could be to a period III third to LMS D1899, while the coach to its left might be a period II third to D1782 or an uncalssified open to LMS D1706. The one to its right, just visible, may be an earlier Period III coach with smaller sliding ventilators. I think the BR coaches are two thirds (TK) and a composite. Then comes a GWR Collett high waist period coach and another.
> 3/ comments on liveries;
The liveries of the coaches are what one would expect in 1958 - some coaches in "Maroon" which looks very dark here and most in either crimson or crimson & cream. Note the variations in the shades of the plain crimson coaches.
> 4/ thoughts on service trains held in sidings (pointers to service timetables / carriage working notices).
I think the eight coach non-gangwayed train on the left may be the workmen's train for the ROF Glascoed which I understand was parked at Aberbeeg when not in use.
The 8th August 1958 was a Friday. The main line train might be for a west to north train, or for an excursion - possibly the next day. I do not know why the have two suburban trains parked together - surely the large 2-6-2T was not kept there all day?
Curiously there are some more photos of Aberbeg on e-bay, including one that may have been taken here a few minutes earlier. See:
http://www.ebay.co.uk/itm/ABERBEEG-...ollectables_Railwayana_RL&hash=item2c9206cf3c
or Google "Aberbeeg station" which is how I found them.
Note the pit props in the furthest line of mineral wagons and the LMS passenger brake van in one of the sidings (identifiable by its side lookout).
In John's reply, the mnemonics RC2 and RCA1 refer to GW Coaches Vol2 and GW Coaches Appendix Vol1, by J Russell and published by OPC.
regards, Graham