The Tank Engine 185 



For small engines the saddle-tank (the 

 tanks fit over the boiler like a saddle, 

 hence the name), was an ideal arrange- 

 ment, but when the locomotive began to 

 grow, the first thing about him to increase 

 in size was the boiler. 



This grew in girth as well as in length, 

 which meant that the saddle-tank over the 

 boiler had to be reduced so much that the 

 locomotive ran short of water. 



In some types this was met by taking 

 the tank the full length of the boiler, and 

 giving it a different shape. 



Such engines can still be seen on the 

 Great Western, being rebuilds of some 

 very fine old o-6-o saddle-tanks. These 

 splendid engines used to be the real 

 handy men of the Great Western they 

 were, in fact, all that a good tank 

 should be. 



Within recent years some new o-6-o 

 tanks have been added and the whole are 

 now classed as Pannier tanks. 



During the present century the tank 

 engine has grown up until, with a very 



