Baldwin Locomotive Works

The engines in this area are organized by Baldwin Engine Class. Baldwin used a nomenclature in naming its engine classes that allowed you to derive number of wheels, diameter of cylinders, number of total wheels and whether the truck was leading or trailing.

Take, for example the subclass 6-10 1/3 C

	6 - Indicates there are a total of six wheels on the engine.
	10 - Indicates the cylinder diameter. Divide this number by 2 and add three any you will find the driver diameter is 8 inches (Ten divided by two is five, plus three is eight).
	1/3 - Indicates there is a two wheel trailing truck. 1/4 would indicate a four wheel trailing truck.
	C - Indicates there are four driving wheels. D would indicate six, E would indicate eight, etc.

So a class 6-10 1/3 C class engine would have four driver wheels, a two wheel trailing truck, and cylinder diameters of 8 inches. The major class would be 6 1/3-C, all engines with six wheels, two pair of drivers, and a two wheel trailing truck.

In addition, within a subclass, engines would also vary by driver diameter, cylinder stroke, wheelbase, weight and a number of other factors.

Because Baldwin supplied builders photos in its catalog for only the major classes, this is how they are listed and organized in the archive. Within major classes, a separate builders photo was provided for engines with different arrangements for fuel and water.

Baldwin Locomotive Works

(c) 2007 Iron Horse 1:29