IV 



THE 4-4-0 AND 4-6-0 LOCOMOTIVES 



So far as express locomotives are con- 

 cerned in Britain we have two distinct 

 methods of driving wheel arrangement, viz., 

 the very popular four-coupled engine, and 

 the rapidly increasing six-coupled type. 

 There may be many variations of these 

 classes, especially when the classes are fur- 

 ther divided into tender and tanks. 



For trains up to 300 tons, on lines not 

 too heavily graded, the 4-4-0 is ideal, and 

 although experts have frequently stated 

 that, as a type, it is doomed, yet the four- 

 coupler has a knack of coming to the front. 

 Thus, of the four big groups, the Great 

 Western is the only one which has ceased 

 to build the 4-4-0. 



Again the 4-6-0, which is the six-coupled 

 evolution from the 4-4-0, is still by far the 



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