File:CarlPuinton 1928 Coventry PresidentWashingon.jpg

Carl Purinton's 1/2" scale, 2-1/2" gauge P7 class "President Washington". Mr. Purinton built the locomotive in 1928 from castings supplied by H.J. Coventry. Originally fitted with Mr. Coventry's piston valve cylinders, Mr. Purinton installed slide valve cylinders several years later. From http://www.friendsmodels.com/otherdesigns/212gaugelocomotives.html