Locomotive appliances . h therail. Small-wheeled freight and suburban passengerengines necessarily require a brake shoe that willcause greater tire dressing than thatnecessary for the large driving wheelsof express locomotives. It has been said withreason that work ondriver and tenderbrakes that will enablethem to wear out brakeshoes is more to be de-sired than quick-actingtriple valves, and it issafe to assume that thebrake which does not wearout shoes in a reasonabletime is doing but little work;before all other considerationsthe brake should have properholding power. The primary point in th
Locomotive appliances . h therail. Small-wheeled freight and suburban passengerengines necessarily require a brake shoe that willcause greater tire dressing than thatnecessary for the large driving wheelsof express locomotives. It has been said withreason that work ondriver and tenderbrakes that will enablethem to wear out brakeshoes is more to be de-sired than quick-actingtriple valves, and it issafe to assume that thebrake which does not wearout shoes in a reasonabletime is doing but little work;before all other considerationsthe brake should have properholding power. The primary point in the consideration of a brakeshoe is friction, and next to this the effect of the shoeupon the tire. The experience of railroad men ingeneral and the results of various tests show thatsteel acts more effectively on the tire than chilled orunchilled cast iron, and for this reason shoes of steel,or steel and iron, for locomotive service, are the mostefficient and popular. The last point to be considered in the brake shoe and. Fie:. Shoo and Its Applica-tion to the Driver. 70 LOCOMOTIVE APPLIANCES. one which is of the least importance in comparisonwith the other two (although oftentimes overlooked bythe purchasing agent in his zeal for cheapness), is thelife of the shoe, or its durability. The brake shoe which lasts the longest is liable tobe the one which does the least work. It can be shownthat by reducing the brake pressure, the same result isaccomplished as would occur from making the shoevery hard. The shoes for locomotive service are: First, the driving brake shoes, which are requirednot only to hold the wheel but also to cut down thetire where it is not acted upon by the rail. Second, the leading truck and tender shoes, whichwhile giving good frictional effect should not act soseverely upon the tires, because of the reduced actionof the rail in wearing into the tires. However, theshoes for the leading truck should cover not only theouter tread but the flange also of th
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectlocomot, bookyear1901
