Rik (of Rik’s Railway) describes how he created a “Fowler” Diesel loco, for his 45mm gauge railway.
http://riksrailway.blogspot.com/2011/04/how-i-converted-playmobil-diesel-into.html
The chassis is a modified Playmobil/LGB Toytrain chassis and the body is a scratchbuild based loosely on a cross between a standard gauge Fowler and a 2′ gauge Fowler.