at 800 revolutions per minute, a total of 4,000 horsepower for 

 the two units combined. Each engine is directly coupled to a 

 generator that supplies direct current to the two traction 

 motors, geared, respectively, to the front and rear axles of its 

 corresponding truck. No power is applied to the center axle, 

 which is for weight distribution only. The joint tractive force 

 of the two units is 108,950 pounds. 



Figure 8 1 . — Model of General Motors diesel-electric locomotive, 1 945. 



103 



