178 Book of Engineering 



To work upon the 3 -ft. gauge track some 

 smaller Drewry cars have been built, these 

 are 40-45 h.p., and except that they are 

 smaller and lighter, they follow generally 

 the details of the broad gauge cars. These 

 rail cars have already proved to be extremely 

 economical, and those employed on the 

 narrow gauge show a total working cost 

 which is under ninepence a mile. 



