. Electric railway journal . rakecontrol and have to stop before passing the derails. Ofcourse, in climbing the grade to Sixth Avenue, the carscannot get full speed out of full power. No corrugationexists on this steep grade on either track between the bot-tom and top, although a few holes have been burned orgouged into the rail by the friction of spinning wheels thatmade no forward headway on the up-grade. These holesmust not be mistaken for nor confounded with corruga-tion, as there is no regular interval between them. Theyare not depressions nor is there any uniformity in theirsize. But on
. Electric railway journal . rakecontrol and have to stop before passing the derails. Ofcourse, in climbing the grade to Sixth Avenue, the carscannot get full speed out of full power. No corrugationexists on this steep grade on either track between the bot-tom and top, although a few holes have been burned orgouged into the rail by the friction of spinning wheels thatmade no forward headway on the up-grade. These holesmust not be mistaken for nor confounded with corruga-tion, as there is no regular interval between them. Theyare not depressions nor is there any uniformity in theirsize. But on the level stretch between Sixth and Thir-teenth Avenues, where cars run free and fast, corruga-tion is plentiful. The brakes and the sliding and roll-ing friction of cars at practically uniform speed con-tribute toward rubbing out what little corrugation mightbe started on the grade sections. INEQUALITY OF WHEEL DIAMETERS Inequality of wheel diameters is related to causes Nos. Ii Reaction Uuliiuj Friction, H^Wheel Dead Propelling Force=Z>. Kail lieaction off Amount of Forward Estrueion; Gradually Decreases withDiminishing Ooutaet, TowardBack of Hail. Lateral Extrusion ani Efiectof Contact. Any CrdinateX-X Varies as Length atElement of Contact in RidingOVtfr partly DevelopedCorrugat
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