Canadian engineer . steel wheels in engine truckservice, that this dimension should properly be 12 5/16 in.,but recently several large companies have called for enginetruck wheels with inside hub faces of either 13 in. or 14in.; in fact, one large system has issued a sheet setting forththat this dimension shall be either 11 in., 12 in., 13 in., 13J^in., or 14 in., under certain conditions. Ninety-five percent, of the solid steel wheels which are in engine truckservice in the United States to-day have 12 5/16 in. diameterof inside hub face. This dimension is standard with theroads which have ha
Canadian engineer . steel wheels in engine truckservice, that this dimension should properly be 12 5/16 in.,but recently several large companies have called for enginetruck wheels with inside hub faces of either 13 in. or 14in.; in fact, one large system has issued a sheet setting forththat this dimension shall be either 11 in., 12 in., 13 in., 13J^in., or 14 in., under certain conditions. Ninety-five percent, of the solid steel wheels which are in engine truckservice in the United States to-day have 12 5/16 in. diameterof inside hub face. This dimension is standard with theroads which have had the longest and most extensive ex-perience with solid steel wheels of this type and I am toldthat it has proved to be a proper and satisfactory cost of manufacturing solid steel wheels, and thereforethe price to the railways, is largely a question of the num-ber of wheels produced per type, and this being the case itseems most important—particularly as regards engine truck —33 —93 Diam- H. * Abstract of a paper read at the meeting of the WesternRailway Club. I \ I Fig. 2.—Steel Wheel for Tenders, Freight andPassenger Cars. wheels of which the total number required is not sufficientlylarge to enable manufacturers, even under the best of con-ditions, to reduce the cost of production to the same levelas that of the other classes of which larger quantities areused—that specific attention and study should be given tothis dimension of inside hub face diameter, so that a stand-ard can be adopted for the best interests of all concerned. For a 6 in. x 11 in. axle the hub diameter is increasedfrom Qj6 in. to 11 in., to provide proper hub wall thicknessand this brings up a point which I wish to make one of theprincipal features of my paper, , what is the proper hubwall thickness for solid steel wheels? .A hub diameter of 9^ in. has long been recognized asall that is required in mounting solid steel wheels on 4J4in. X 8 in., or 5 in. x Q in., or 52 in. x
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