Commemorating the centenary of the GWR’s gauge conversion, very numerous b&w illustrations from photographs, engravings, paintings, drawings, reproductions of advertisements and diagrams, location map, bibliography, index, 144 pp, black boards in d/w, top edge of d/w slightly creased, otherwise in very good condition, Oxford Publishing Co (Yeovil, Somerset) 1992
27.3 x 21.1 cm, 800g, ISBN 0 86093 504 3
See the description below from the dustwrapper flap. As far as we can establish, this is the only book ever published specifically on the GWR broad gauge.
Long out of print.