60 Book of Locomotives 



Dean >: helped largely to seal the fate of 

 the " Singles " and later their four-coupled 

 successors. By their splendid performances, 

 the 4-6-05 led to the discontinuance of 

 4-4-0 building, and also secured the con- 

 version of all existing " Atlantics " to six- 

 couplers, excepting always the fine trio of 

 De Glehn compounds of the 4-4-2 formula, 

 which having been rebuilt remained in 

 service till the years 1926-1928. 



For some time the Great Western 4-6-05 

 were two-cylindered machines, but later, 

 when four cylinders were tried with the 

 " Star " class, they showed such superiority 

 over the earlier locomotives that four cylin- 

 ders became standard on the Great Western 

 for the 4-6-0 express machines. This 

 does not mean that the building of the 

 two cylinder locomotives was ceased at 

 once. 



So we come up, through many sub- 

 classifications, via the ' Abbeys ' to the 

 now world-famed " Castles " and " Kings ", 

 the latter considered by many good judges 

 the best 4-6-0 engines now running in 



