. American engineer and railroad journal . ithout excessive weight. Cylinders.—As is customary on the Pennsylvania Railroad, thecylinders are cast separate from the saddle. The saddle casting in this case has a passage which conveys the steam from thesteam pipes and emerges in the center just above the frames,wliCre it is continued by a short steam pipe with a slip joint con-necting to the center of the valve chamber. The exhaust pass-age in the saddle is single and connects to its continuation inthe cylinder casting directly, without the use of an extra the cylinder casting the exhaus
. American engineer and railroad journal . ithout excessive weight. Cylinders.—As is customary on the Pennsylvania Railroad, thecylinders are cast separate from the saddle. The saddle casting in this case has a passage which conveys the steam from thesteam pipes and emerges in the center just above the frames,wliCre it is continued by a short steam pipe with a slip joint con-necting to the center of the valve chamber. The exhaust pass-age in the saddle is single and connects to its continuation inthe cylinder casting directly, without the use of an extra the cylinder casting the exhaust passage divides and emergesfront and back just back of the valve chamber. The valvechamber heads are specially designed to connect and furnish thepassage for the exhaust steam from the end of the valve cham-ber to this passage in the cylinders. In this manner the castingsfor both cylinders and saddle are very much simplified and arecapable of being designed with greater assurance than is pos- 72 AMERICAN ENGINEER AND RAILROAD SADDLE CASTING—CLASS h8b LOCOMOTIVE. sible where the passages are all contained in one casting. Theillustrations show the details. The frames are in slab form 12in. in depth, where they pass between the cylinders and saddleand are set into recesses in both of these castings, which aresecured together above and below as well as through the Gear.—A design of Walschaert valve gear, which is allin one vertical plane has been permitted by setting the valvechamber 5 in. outside the center line of the cylinders. Thevalve gear is a very straightforward simple arrangement. Thevalve stem connects to a crosshead supported by a bracket seton top of the guides, to which is also connected the combina- tion lever. The link is supported back of the guide yoke, andits lower extension at the connection for the eccentric rod hasa lever arm of 24]^ in., bringing this point almost to the centerline of the drivers. The path of the pin on the retur
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
