. American engineer . and super-heated steam locomotives, which clearly show the advantagesof the latter. It is believed that this is the first time that acomparison of this sort has been made. One set of indicator Tires made of heat treated chrome-vanadium steel were appliedto a Pacific type locomotive weighing 229,500 lbs. total, and150,500 lljs. on drivers, which was put in service on a divisionhaving numerous curves ranging from 3 to 14 deg. The averagenumber of brake applications per trip was nine for station stopsand four for crossings and slowdowns. Although flange lubrica-tors were use
. American engineer . and super-heated steam locomotives, which clearly show the advantagesof the latter. It is believed that this is the first time that acomparison of this sort has been made. One set of indicator Tires made of heat treated chrome-vanadium steel were appliedto a Pacific type locomotive weighing 229,500 lbs. total, and150,500 lljs. on drivers, which was put in service on a divisionhaving numerous curves ranging from 3 to 14 deg. The averagenumber of brake applications per trip was nine for station stopsand four for crossings and slowdowns. Although flange lubrica-tors were used on the other locomotives on this division nonewere applied to this locomotive. These tires, after an enginemileage of 121,000 miles, were found to still have good contours,but because of necessary repairs to other parts the locomotivewas shopped. \ sister engine in identical service had a newset of carbon steel tires applied one month after the vanadiumtires were put on and these tires gave a mileage of only 60,040. Chrome-Vanadium Driving Tire After a Drop Test. miles before having to be turned. It was necessary to reducethe diameter by ^ in. in order to ])uild up the worn flange. In switching servict. chrcme-vanadium tires have given four-teen months service, double turn, with a maximum wear of only;4 in. It is reported that these tires, which are now on theirthird term of service between turnings, will probably be goodfor a fourth term. Other railways in considerable numbers are now orderingtires of this material, and a specification has been prepared afterexhaustive experiment and research by the tire makers and theAmerican Vanadiutu Company. In developing this specificationthe effort was to determine the particular chemical compositionof chrome-vanadium steel and the proper heat treatment whichwould give the highest wearing qualities. The success of the 16 AMERICAN ENGINEER. Vol. 87, No. 1. specifications, which are given in full at the end of this article, isillustrated
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
