. Railway mechanical engineer . em is a very- unusual departure fromstandard .American practice. Instead of the three point sus-pension introduced by Eastwick & Harrison in ISoS, whichhas been universally used in this country for many years, afour-point suspension has been adopted. The leading truckis equalized with the front pair of driving wheels, the threecenter pairs of driving wheels on each side are equalizedtogether and the rear pair of drivers are equalized with thetrailing truck. The valve motion which is of the Walschaert t)-pe, has anextremely long travel. While a full gear travel o
. Railway mechanical engineer . em is a very- unusual departure fromstandard .American practice. Instead of the three point sus-pension introduced by Eastwick & Harrison in ISoS, whichhas been universally used in this country for many years, afour-point suspension has been adopted. The leading truckis equalized with the front pair of driving wheels, the threecenter pairs of driving wheels on each side are equalizedtogether and the rear pair of drivers are equalized with thetrailing truck. The valve motion which is of the Walschaert t)-pe, has anextremely long travel. While a full gear travel of seveninches has usually been considered the tliat couldbe attained with this type of valve motion the design used onthese engines gives a travel of 8J^ in. The long travel issecured without angularity by the use of a long ra-dius rod and a long link combined with an eccentric crankof large throw. A similar arrangement has been in use forsome time on a Consolidation locomotive, and the results ob- K—. iii-~— Back End Main Rod; Pennsylvania Lines West 2-10-2 Locomotive tained have demonstrated that the theoretical advantage ofthe long travel is borne out in actual practice. The steam lapof tlie valve is l/g in. and the lead 4 in. The 14-in. pistonvalve has a long spool and the passages to the cylinder aremade as short and direct as possible. The cylinders, whichare .lO in. in diameter wtli a .li-m. stroke, have a Z-shapedpiston with a cast steel center ana a cast iron bull ring. Thecylinder lubrication is effected by a two-feed force feed lubri-cator which is attached to the left steam chest. A two-feed hydrostatic lubricator located in the cab is providedto supply oil to the air pumps and the cylinders of thestoker engine. The boiler has been designed with a view to seciu-ing ade-quate volume, and a large fire area tlirough the firebo-\ is fitted with a brick arch and has a combustionchamber approximately 5 ft. long. There are 54
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
