Development of Locomotive 3 1 



Northern type and also a few of the North 

 Eastern type. One must be careful to add 

 that the "Pacific* type may not be the 

 final wheel development of the express 

 engine on British metals, though at the 

 moment it seems likely. Abroad the eight- 

 coupled express engine has arrived. Al- 

 though a wheel formula of 4-8-0, or even 

 4-8-2, seems unlikely here, we must admit 

 the possibility. Without doubt a great in- 

 crease in load pulling is achieved by coup- 

 ling still another pair of wheels. On the 

 other hand the speed does not appear to 

 suffer. There is still this point, however, 

 that the huge " Pacifies " on the London 

 and North-Eastern and the ' Kings " of 

 the 4-6-0 wheel formula on the Great 

 Western can manage any reasonable train, 

 and to work longer trains means consider- 

 able expense in lengthening platforms. It 

 is probably better to divide a train when 

 it gets so long. 



' Mixed traffic " types differ considerably 

 on various lines. Thus, on the old North- 

 Western you would have searched in vain 



