130 Book of Locomotives 



care and the latter all bear the mother shed 

 number. 



This particular engine whose work we 

 will follow has a flexible brake pipe at 

 either end of the frames, so that she can, 

 when required, take her corner on pas- 

 senger traffic. This makes the six- coupler 

 the most useful engine on the line, for 

 while a passenger engine can and does 

 work goods trains, her bigger driving wheels 

 are at a disadvantage, since they are in- 

 clined to slip with a heavy load behind the 

 tender. In the case of the goods engine, 

 despite rather small driving wheels, there 

 is nothing to prevent her employment on 

 really fast trains, and on the slower stop- 

 ping passenger trains she does as well as 

 the express engine. 



Now the fact that our engine has the 

 passenger brake affects her future straight 

 away after leaving the works. She is placed 

 in what is called a ' ' link " and because 

 she can do good work on either class of 

 traffic, she is put in what we will call a 

 " mixed traffic " link; that is, her duties 



