Development of Locomotive 33 



running heavy passenger trains up to town; 

 the middle part of the day dealing with 

 goods traffic, including shunting, and at 

 night they are bearing tired London workers 

 back to their homes in the country. The 

 newer " mixed traffics " on this system, and 

 others, are so similar to the 4-4-0 and 

 4-6-0 passenger types that few would detect 

 the difference unless a glance were taken at 

 the coupled wheels; these are usually much 

 smaller. 



Then we come to the goods engine, and 

 these vary from the powerful 2-8-2, some- 

 times called by the American term " Mikado", 

 to the more numerous o-6-o already men- 

 tioned. For heavy work most of our rail- 

 ways prefer the eight-coupled type, since 

 there is greater adhesion. But we should 

 have looked in vain for such an engine on 

 the old Midland, owing to the fact that very 

 heavy engines could not be regularly 

 employed on that system until certain 

 strengthening operations had been under- 

 taken. That did not prevent the Midland 

 building a ten-coupled tender engine a 



