. Railway mechanical engineer . whenfirst built, 21-in. cylinders—the largest ever used in expressservice at that time. The cylinders were inside the framesand the leading axle was the crank axle. The cylinderssubsequently were reduced to 20 in. in diameter and morerecently further engines of this type were built having and some detail modifications, such as the substi- ceived attention, and the London & North Western and theGreat Western, especially the latter, have large numbers offour cylinder simple superheater engines at work giving fineresults. When considering cylinders,
. Railway mechanical engineer . whenfirst built, 21-in. cylinders—the largest ever used in expressservice at that time. The cylinders were inside the framesand the leading axle was the crank axle. The cylinderssubsequently were reduced to 20 in. in diameter and morerecently further engines of this type were built having and some detail modifications, such as the substi- ceived attention, and the London & North Western and theGreat Western, especially the latter, have large numbers offour cylinder simple superheater engines at work giving fineresults. When considering cylinders, it is natural to turn to thequestion of compounding, which in England has been in thepast a much debated point. The late F. W. Webb of Crewefor many years upheld the use of compound cylinders, moreparticularly his own three cylinder system as exemplified inhis Greater Britain or Queen Empress type and latterlyby the four cylinder Jubilee type. At the present time theonly compounds of note are those running on the Midland. Slx-Coupled, Four Cylinder, Superheater Locomotive, London & North Western tution of direct stays for staying the firebox crown instead ofroof bars, and some alteration in the size of the motion bear-ing surfaces. Now all have been rebuilt with Schmidt super-heaters and fitted with 20l/2-m. cylinders having pistonvalves, the steam pressure being 180 lb. against 200 lb. origi-nally used. From what has been said of the six-coupled design, it willbe seen that some designers favor inside cylinders and othersuse outside cylinders and connections; with the exception ofthe Caledonian and the London & North Western, however,nearly all the six-coupled express engines in use have outsidecylinders. No doubt, the long connecting rods obtained, to- Railway and known as the Smith three cylinder system, thearrangement comprising the use of one high pressure cylinderexhausting into two low pressure cylinders, which is exactlythe reverse of the Webb system.* Other features
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
