GWR Backheads

[SimonT]

I am trying to find a decent photo of the backhead for the GWR S4 boiler on the Dean Goods, Stella, etc, etc. There is a decent photo of a B4 backhead in Russell and there is of course the Steam example but the S4 seems to do a good job of hiding. Anyone any ideas?

SimonT

 

[Dog Star]

How do peeps identify a S4 boiler? Or a B4 for that matter?

I ask because there are a number of "cab views from coal space" from the Edwardian era in books by Adrian Vaughan.

 

[unklian]

Roughly S and W indicate a flush or smooth round top firebox, R is a raised round top firebox and B is a belpaire firebox. This being GWR "standardisation" though don't bank on it. The numbers are a different prospect and seem to indicate variations in dome position, etc. You really need the RCTS books for the definitive word on any particular combination of loco and boiler .