File:The railroad and engineering journal (1887) (14757943531).jpg

Identifier: railroadengineer65newy (find matches)
Title: The railroad and engineering journal
Year: 1887 (1880s)
Authors:
Subjects: Railroad engineering Engineering Railroads
Publisher: New York : M.N. Forney
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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t due to the compound working, becausethe machine is more powerful and draws a heavier load,but as it is not sensibly heavier than the other and asthe double expansion here has allowed us to make thisarrangement in a practical manner, at the same time reallysimplifying the engine, I believe that the entire saving canjustly be credited to the compound. For standard gauge I might mention the 3S-ton engines tion in the arrangement of the steam-pipes. This is thecase where, in spite of the adversaries of the system, thecompound engine, which they represent as complicated, is really the opposite and does away with complication incertain delicate parts of the locomotive. This might be the place to say something of the startingarrangements and of the valve gear used on compoundengines of three or four cylinders, as we have already * These engines are exceeded in weight by the locomotivesfor the St. Clair Tunnel, lately completed at the Baldwin Works. Vol. LXV. No. 5.) ENGINEERING JOURNAL. 20s
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spoken of those parts of the two-cylinder engines. The question ofstarting has less importance for thefirst, and it has generally been con-sidered sufficient to put in a valvepermitting direct steam from theboiler to be used in starting ; a safe-ty-valve or reducing valve limits thepressure, which can thus be madeone-half the boiler pressure. Insome of the Decauville engines Ihave placed a starting valve, whichallows both groups of cylinders tobe worked as ordinary engines incase of necessity. In the heavy en-gine on the Gothard Railroad a sim-ilar apparatus has been put in, sothat the engine can, when required,start heavy trains on the long gradesof 2.6 per cent. We have seen above that Mr.Webb had recently proposed to usean arrangement of this kind on hisengines ; but this arrangement wouldonly be justified by coupling the twogroups of driving-wheels. In the Baldwin engine the high-pressure cylinders carry a steam-pipe which joins their two extremi-ties and a valve which, when opene

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