Hi Mark,
I have a few books which may help although I'm sure you've probably already got access to them. If not yowm welcum to a borra.
History of the Pensnett Railway by W.K.V.Gale - ISBN0 900404 28 0
Through Birmingham Snow Hill which, despite the title has some BC piccies in it. - Michael Hale ISBN 9501951 1 1
Black Country Railways by Ned Williams ISBN 0 7509 0934 X
Lost Railways of Birmingham and the West Midlands by Terry Moors ISBN 978 1 84674 109 8
Stourbridge to Wolverhampton Middleton Press ISBN 978 1 906008 16 1
Lost Lines of Birmingham and the Black Country Nigel Welbourn ISBN 0 7110 2844 3
Railways of the Black Country Vol 1 The Byways Ned Williams ISBN 0 9500533 8 4
and Vol 2 The Main Lines ISBN 0 9500533 9 2
British Railway Pictorial Black Country Paul Collins ISBN 0 7110 2969 5
and OWW Part 2 Bob Pixton ISBN 1 870754 60 3
Phew !