Some Locomotive Freaks 189 



Whilst engineers followed the lead of 

 Stephenson in coupling as many wheels as 

 possible, none followed Brunton with his 

 walking engines. And only for mountainous 

 tracks, such as the railways up Snowdon 

 and the Alps, was Blenkinsop's idea of the 

 cogged wheel on the locomotive, and the 

 corrugation of the rail, employed. 



The corrugation in the mountain lines 

 was moved to the centre of the track, be- 

 coming a separate rail, instead of being 

 cast with the running rails. 



Those were the earlier types of freakish 

 engines, and after our railways were fairly 

 established, the development of the loco- 

 motive followed on definite lines. That is 

 to say, the designers discovered what wheel 

 formula suited the needs of their particular 

 railway, and then proceeded to give the 

 best engines possible to that formula. Thus, 

 for express work on the more level routes 

 the single-driver was the favourite type. 

 On the hillier routes the four-coupled engine 

 was prime favourite ; and for goods work the 

 six-coupled engine was practically supreme. 



