. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . power. The effect of wheel sliding is to length-en the stop, but the extent of the length-ening depends upon the amount of thewheel sliding and the braking power be-ing used. Whether the sliding of wheels will orwill not cause flat spots of a sufficientsize to produce rough riding of the cardepends entirely upon circumstances; forexample, a condition of rail surface thatwill cause a considerable amount of wheel considerable distances on a bad rail pro-ducing but small flat spots, whereas with
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . power. The effect of wheel sliding is to length-en the stop, but the extent of the length-ening depends upon the amount of thewheel sliding and the braking power be-ing used. Whether the sliding of wheels will orwill not cause flat spots of a sufficientsize to produce rough riding of the cardepends entirely upon circumstances; forexample, a condition of rail surface thatwill cause a considerable amount of wheel considerable distances on a bad rail pro-ducing but small flat spots, whereas withbetter rail conditions instances of wheelsliding were observed to produce flatspots of considerable size when the wheelsslid a much shorter distance. No flatspots of sufficient size were obtained tonecessitate changing wheels during thetests, although, it was found advisable, onaccount of the number of small spots ac-cumulated on the wheel tread, to changesome wheels before the cars were putback into regular service. \s to the variation in rail friction dur-ing different periods of the day, common. BRAKE CYLINDER PRESSURE INDICATOR. sliding, with relatively low percentagesof braking power, is a condition which atthe same time will permit long slides tooccur without producing noticeable flatspots. On the other hand, when rail conditionsare good, or in the extreme case of asanded rail, a very short slide may pro-duce flat spots of sufficient size to requireprompt attention. The amount of flat-lening is further contributed to by theweight upon the wheels and the materialin the wheels and rail. The effect of railconditions on the amount of flatteningproduced was brought out during thetests, there being many cases observedwhere the wheels picked up and slid for experience leads us to expect a bad railcondition with a combination of low tem-perature and high humidity, and the con-clusions follow from a knowledge of railconditions in general and their effect ir-respective of the readi
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