. The Street railway journal . ars follow : Passenger Mail Baggage and express Special baggage and express Passenger and baggage Dining Suburban passenger Suburban passenger and baggage I^ength. Weight. 70 feet .5J inches 71 feet 10| inches60 feet 10| inches 70 feet 71 feet 1 inch71 feet llf inches54 feet 4 inches(Same as suburban , .50091,00091,000120,000130,000140,,000passenger.) Trucks. 4-wheel4-wheel4-wheel6-wheel6-wheel6-wheel4-wheel In the design of framing for steel cars two general typeshave been developed. In one the center sill is made strongenough to resist the end loads d
. The Street railway journal . ars follow : Passenger Mail Baggage and express Special baggage and express Passenger and baggage Dining Suburban passenger Suburban passenger and baggage I^ength. Weight. 70 feet .5J inches 71 feet 10| inches60 feet 10| inches 70 feet 71 feet 1 inch71 feet llf inches54 feet 4 inches(Same as suburban , .50091,00091,000120,000130,000140,,000passenger.) Trucks. 4-wheel4-wheel4-wheel6-wheel6-wheel6-wheel4-wheel In the design of framing for steel cars two general typeshave been developed. In one the center sill is made strongenough to resist the end loads developed by pulling andbuffing, in addition to the transverse loads due to the weightof underframe, superstructure and loading. In the othertype the plate girders formed by the sides of the car be-neath the windows are relied upon to carry the transverseload due to the weight of the underframe, superstructureand loading. The center sill in the latter type is usuallyrather light, being designed to resist the end loads developed. L AND SIDE POSTS OF PENNSYLVANIA STEEL MAIL CAR, SHOWING TYPE OF CENTER SILL AND CROSS BEARERS USED IN PASSENGER COACH by ordinary pulling and light l)uffing. This t_\-pe of fram-ing follows the general form used in wooden cars wherethe transverse loads are carried by wooden trusses withinthe sides of the car reinforced by truss rods beneath the sidesills. By careful calculation, it has been found that when theloads due to pulling and buffing are less than 100,000 weight and cost of a car frame of either type will bepractically the same. Where loads due to pulling and June 8, 1907.] STREET RAILWAY JOURNAL. lOII buffing exceed 100,000 lbs., the framing for the type, where heavy equipment except that it is shorter and lighter, the the sides carry the loads, increases considerably in weight description will be confined to it. For the center sill type, the loads due to pulling and buffing The center sill is a continuous box girder formed
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
