. American engineer and railroad journal . often damaged in handling before they can be applied tothe cars. In constructing a new passenger coach, the roof of the car, asgenerally built, has to be supported from the floor by posts untilthe sheathing and lining are complete, so as to make it In the semi-elliptical roof, the posts and carlines a rule, made as one steel unit with no joints; as illustratedby Fig. 2, Plate J, it is claimed of much lighter construction thanany wood or combination material ordinarily used in the double-deck type of roof, and extends from one
. American engineer and railroad journal . often damaged in handling before they can be applied tothe cars. In constructing a new passenger coach, the roof of the car, asgenerally built, has to be supported from the floor by posts untilthe sheathing and lining are complete, so as to make it In the semi-elliptical roof, the posts and carlines a rule, made as one steel unit with no joints; as illustratedby Fig. 2, Plate J, it is claimed of much lighter construction thanany wood or combination material ordinarily used in the double-deck type of roof, and extends from one side sill up over theroof and down, joining into the other sill, forming one of thestrongest shapes known—self-supporting from the time it isfastened to the side sill, each member reinforcing and addingstrength to its additional members; the efficiency and strengthof such designs seem obvious to its advocates. The adherents of the upper-deck type of roof contend that theclaims for superior strength in the semi-elliptical roof are based. Fie I. more on theorj than air. | | proof, [t is beli hat th( style id roof carline used with the upper deck can ! everj way as strong as thi carline for a semi-elliptii roof, having the same depth of root from eaves to erown, 0practically as strong and without any undue increasi inI he claim thai a mot of semi-elliptical shapi i practical! collapsible, if the car is turned over in a wreck is (pi, tilby its opponents. It is interesting I te that in recent con-slructi 11 British and European railways the upper diet; type of roof is rapidly superseding thi semi-elliptical type whereverthe restrictions of tunnels will permit the change. Ibis wouldindicate that the roads who have longest used semi-elliptical roofs find them less satisfactory than the American upper dec!loot Some memliers of the Association are familiar with alarge number of passenger ears in the East constructed withoutany heavy upper deck sills or plates, hut every earliiie was
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
