eastglosmog

Many thanks for the recommendation, folks.  Bought copies of the first two volumes last week and they are superb.

A couple of pictures of a Bedford OB/Duple of 1949 taken at Gloucestershire Steam fair in 2015.

Seen in the loo of a quarry I was visiting today....

Just as a matter of interest, you don't have to use the Code100 to Code 75 adapter to change from one to the other, Peco do special rail joiners, (SL112), which will do the job without any intervening track.  I got some from Antics in Gloucester. They are insulating or conducting depending on whether you put the metal insert in.

I know some GWR footbridges could be quite elaborate, but not all of them were!  Wantage Road, for instance was a plain plate girder structure, similar to this one at Southam Road http://www.warwickshirerailways.com/gwr/gwrsrh290.htm. If doing it in 4mm/ft, you might even manage to use a Wills varigirder kit!  Just make sure you don't have a powerful landowner nearby who has to be placated by an elaborate bit of ironwork.

In addition to the points made above, one other point to remember about whether an overbridge or subway would be used is that the footbridge would not be subject to any great loading, so could be a cheap structure.  Any subway would have to be built strong enough to withstand the weight of passing locomotives and would consequently be a much more robust and costly structure.

Just looking through some of my picture books of railways, and in GWR days at least, Swindon,  Wootton Basset and Wantage (all on the main line east of the Badminton cut off and all junction staions), Brinkworth (on the Badminton cut-off) Corsham and Box (on the main line to Bristol) all had footbridges.