White Steam Car engine. 20 h.p. 'O' series engine. Stamped 'O 618'. Currently on support stand and under my Christams tree! Stands approx. 24" overall.
Two cylinder steam engine. Manufactured by Diahatsu 4" + 4" x 4 1/2" approx. in the early 1950's. Very sturdy. A second engine is available for spares.
Overall size: 30" x 22 1/2" x 10 1/2" approx.
I understand that an engine identical to this has been used to build a 6" scale steam bus with great success - perhaps an inspiration to some of you model builders !