4-4- an d 4-6-0 Locomotives 67 

 produced a four-cylinder engine which, 

 with a little enlargement, in later series, are 

 amongst the most powerful engines on the 

 L.M.S. 



The Great Central also came to the six- 

 coupled express engine in the early part of 

 the century, and conducted some useful 

 experiments by building two series of 

 engines, whose only difference was in the 

 matter of coupled wheels. In the long trials 

 which followed there was little to chose 

 between the 4-4-25 and the 4-6-03, but 

 later practice showed a tendency to the 

 latter type, some fine outside and inside 

 cylindered engines being brought out. 



The Caledonian brought out their cele- 

 brated ' Cardeans >: rather more than 

 twenty years ago, and although the class 

 was limited in numbers, with coupled wheels 

 of relatively small diameter, some splendid 

 work was done with them. Later the wheel 

 diameter and boiler dimensions were in- 

 creased, and a further batch of the latest 

 Caledonian design was added to the L.M.S. 

 stock after the grouping. 



