After tackling the GW pannier tanks in his 'Locomotive Portfolios' for Pen & Sword, author David Maidment seeks out descriptions and photographs of the GW 0-6-2 tank engines, the majority of which were built by the Rhymney, Taff Vale, Barry and other Welsh railways from the last decade or so of the nineteenth century onwards. The engines of eight different companies, absorbed by the GWR in 1922, are described and illustrated, and the way in which...