. Electric railway journal . Pittsburgh Double-Deck Car with Separate Entrance and Exit Doors which were supported by pocket brackets attached tothe main sill. The posts and roof were of wood. Thisunusual construction was described in the ELECTRICRailway Journal for March 2, 1912. SIDE GIRDER CONSTRUCTIONIn a form of all-steel construction which is used largelyfor center-entrance cars, the weight of the car is taken bythe sides acting as girders, while the underframe servesmerely to carry the flooring. The side girder construc-tion appears well adapted for low-step center-entrancecars, as it a
. Electric railway journal . Pittsburgh Double-Deck Car with Separate Entrance and Exit Doors which were supported by pocket brackets attached tothe main sill. The posts and roof were of wood. Thisunusual construction was described in the ELECTRICRailway Journal for March 2, 1912. SIDE GIRDER CONSTRUCTIONIn a form of all-steel construction which is used largelyfor center-entrance cars, the weight of the car is taken bythe sides acting as girders, while the underframe servesmerely to carry the flooring. The side girder construc-tion appears well adapted for low-step center-entrancecars, as it avoids the use of the heavy special underframing which would otherwise be required by the center-. Typical Steel Underframe of Side Girder Construction well construction; it also insures maximum clearances be-tween the bottom framing and the pavement. ThePittsburgh trailer of 1 909 and the Pittsburgh motor carof 1911 are early examples of this construction. Inthese cars the load transmitted from the bolsters is car- transmit the compressive stress in the belt rails up over thedoorway and down to the opposite belt rail. The firstgroup of Pittsburgh cars had wooden posts which wereheld between light channels, the second had woodenposts held between angles to insure easier removal ofdamaged plates, while the third group of cars had hollowposts of pressed steel weighing about one-half of theother design. Needle beams are used as floor members. The center-entrance cars of the Brooklyn RapidTransit Company built in 1912 also have a frame ofpressed steel. Each side of the car forms a girderconsisting of the side plates, belt rail, letterboard and sideposts, all of which are riveted to eac
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
