. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . SECTION BETWEEN FRAMES. non-stop runs, with numerous slow-downs and severe gradients to beclimbed, and the necessary rapid ac-celeration when starting and promptrecovery after checks, lead to the 4-6-0design. The Atlantics. although power- inside pair of cylinders are placed for-ward of the bogie center line and driveon to the leading cranked axle; theoutside cylinders are placed at the backof the bogie center line and drive on tothe centre coupled wheels. The cranks. FOUR-CYLINDER SIMPLE 4-6
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . SECTION BETWEEN FRAMES. non-stop runs, with numerous slow-downs and severe gradients to beclimbed, and the necessary rapid ac-celeration when starting and promptrecovery after checks, lead to the 4-6-0design. The Atlantics. although power- inside pair of cylinders are placed for-ward of the bogie center line and driveon to the leading cranked axle; theoutside cylinders are placed at the backof the bogie center line and drive on tothe centre coupled wheels. The cranks. FOUR-CYLINDER SIMPLE 4-6-0 ON THE GREAT WESTERN OF ENGLAND. engines of this type have been for sev-eral years at work on the London andSouthwestern, the Great Northern andthe Glasgow and Southwestern. It isin the combination of the six-coupledwheels with the four high-pressurecylinders that Mr. Churchwards type isunique. ful enough in other respects, had beenfound deficient in adhesion with heavytrains. The tractive effort of both class-es is practically the same—26,560 lbs.,but with the four-coupled wheels theadhesive weight is only 39^2 tons asagainst 58^2 tons for 4-6-0 engines withsame boiler, etc. are set on all quarters, the outsidecylinder crank being at 180 deg. to thatof the adjacent inside cylinder. The prevailing practice in the useof Walschaerts valve gear in this coun-try is to put it on the outside of therods. The fact that the gear is readilyadaptable to this form of design is one 344 RAILWAY AND LOCOMOTIVE ENGINEERING August, 1908. of the reasons for its popularity i
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