Yes, but there were many miles of 30 inch guage and other narrow gauge railroads outside of North America. A fine point that just about all the North American manufactures noted and made good use of. There is another thread going on World War I and II equipment and where it ended up (some of which is still running). Many of us old time modellers like to enjoy narrow guage railroading without being tied down to what some road might have done lo those many years ago. Model Railroading is FUN. Let us keep it that way.