Model locomotive valve gears

"Martin Evans, who is Editor of "Model Engineer", has made a special study of locomotive valve gears, and has carried out much practical work in connection with them. This new book thoroughly covers the whole subject and provides practical help to all those interested in designing and building model locomotives.
Among the valve gears described are Stephenson, Gooch, Allan, Joy, Hackworth, Marshall, Walschaerts, Baker, Beames, Jones, Greenly's corrected, Caprotti, Cossart, etc." (Dustjacket blurb, 1962 ed.)