. Railroad construction. Theory and practice . tal. The use of metal in car constructionis very rapidly increasing,. The demand for greater strengthin car-frames has grown until the wooden framing has becomeso heavy that it is found possible to make steel frames andtrucks at a small additional cost, the steel frames being twiceas strong and 3^et reducing the dead weight of the car about5000 lbs., a consideration of no small value, especially on roadshaving heavy grades. Another reason for the increasing useof metal is the great reduction in the price of rolled or pressedsteel, while the cost o
. Railroad construction. Theory and practice . tal. The use of metal in car constructionis very rapidly increasing,. The demand for greater strengthin car-frames has grown until the wooden framing has becomeso heavy that it is found possible to make steel frames andtrucks at a small additional cost, the steel frames being twiceas strong and 3^et reducing the dead weight of the car about5000 lbs., a consideration of no small value, especially on roadshaving heavy grades. Another reason for the increasing useof metal is the great reduction in the price of rolled or pressedsteel, while the cost of wood is possibly higher than advocates of the use of steel advise steel floors, sides, box-cars a wooden floor has advantages. For ore andcoal-cars an all-metal construction has advantages. (Fig. 201.)In Germany, where steel frames have been almost exclusivelyin use for many years, they have not 3^et been able to determinethe normal age limit of such frames; none have yet ivorn life is estimated at 50 to 80 year^.. Fig. 200.—100,000-lb. Box Car.
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