490 



Popular Science Monthly 



The tiny electric locomotive on the small track is as mighty, weight for weight, as the 



giant which fills the background 



Not a Toy — A Real Locomotive 



THE engineer is standing next to the 

 largest electric locomotive in the 

 world. But the youngster in the fore- 

 ground is not a top by any means; it is 

 a lusty, able, mining locomotive weighing 



A British army tractor which crossed England despite 

 many difficulties 



five thousand pounds. Pound for pound 

 and volt for volt, it can draw just as 

 heavy a load as its big brother behind, 

 which weighs five hundred and sixty 

 thousand pounds. The big motor is 

 driven by a current of three thousand 

 volts, while the "toy" which 

 runs on a twenty-inch gage 

 track, is driven by a self-con- 

 tained storage-battery, de- 

 livering eighty-five volts. 



A Difficult Journey for 

 an Army Tractor 



WAR certainly gives rise 

 to strange exigencies. 

 In the illustration may be 

 seen a big tractor transport- 

 ing a large, awkward load 

 through a flooded road in 

 Berkshire, England. Diffi- 

 culties were encountered eve- 

 ry mile. Telegraph wires 

 were always in the way, tree 

 branches seemed surprisingly 

 numerous, and arches reared 

 themselves in the path of 

 the vehicle. 



