. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ral resultants atthe engine truck and the first driver arejust about the same in amount. It willthus be seen that, in effect, the enginetruck and the first driver act in practi-cally the same way as a four-wheel en-gine truck in guiding the front of thelocomotive, except that the lateral resist-ance is applied in the plane of each wheelinstead of being applied midway betweenthe wheels and divided between them, asin the case of a four-%vheel truck. As faras guiding the engine is concerned, the
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ral resultants atthe engine truck and the first driver arejust about the same in amount. It willthus be seen that, in effect, the enginetruck and the first driver act in practi-cally the same way as a four-wheel en-gine truck in guiding the front of thelocomotive, except that the lateral resist-ance is applied in the plane of each wheelinstead of being applied midway betweenthe wheels and divided between them, asin the case of a four-%vheel truck. As faras guiding the engine is concerned, there-fore, the arrangement is very similar toa four-wheel truck application with the fleet, thus preventing the cramping of thedriving wheel base in the curve and ex-cess pressure upon the driving wheelflanges. It should be noted that the action ofthe rockers provides a limit to the lateral four also be applied to engines bavins;wheel trucks. On the ordinary design of 2-10-2 types,about 80 per cent, of the total weight ofengine is on the drivers. It is thereforeinteresting to note the increase which. \IEW or FKONT nRI\ ER IN POSITION. pressure wliich can be placed upon the has been obtained on these new driving wheel flange. When this Total Weieht on Per- lateral resistance exceeds 20 per cent, of x. y. q. & 1^% ^stSSo fjT the weight carried upon the lateral motion Ee rockers, the boxes will deflect, the excess Most careful attention was given to lateral pressure being then transferred to the boiler design. 148 RAILWAY AND LOCOMOTIVE ENGINEERING. Mav, 1916. Diameter ofTotal Super- Boiler at Heating heating Tube LargestSurface. Surface. Length. Ft. Sq. Ft. Ft. Ins. Y. O. & \V. 4,498 1,007 17—0 98 Erie 4,959 1,274 17—0 104 These excellent boilers have the addedadvantages of a short tube length and a
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