. Electric railway journal . bolsters lightT-irons are rivetedacross between theside sills to supportthe ends of twosimilar longitudinalmembers which reston top of the bolsterand carry the motortrap doors in the carfloor. The end sillsare 3-in. x 3-in. x !4s-in. angles, bent around the cornersand riveted to thebottom angles of theside sills. The platxorm 1111-derframing consistsof two 4-in., , bolted un-der the gusset platesof the transom near-est the end sill andresting on top of theend sill. These chan-nels support the 3-in. angle-ironbumper. The plat-form floor is sup-po
. Electric railway journal . bolsters lightT-irons are rivetedacross between theside sills to supportthe ends of twosimilar longitudinalmembers which reston top of the bolsterand carry the motortrap doors in the carfloor. The end sillsare 3-in. x 3-in. x !4s-in. angles, bent around the cornersand riveted to thebottom angles of theside sills. The platxorm 1111-derframing consistsof two 4-in., , bolted un-der the gusset platesof the transom near-est the end sill andresting on top of theend sill. These chan-nels support the 3-in. angle-ironbumper. The plat-form floor is sup-ported in the centerby two wooden sills,4 in. x 2) 2 in., whichrest on the body endsill but are not bolt-ed or otherwise fas-tened to the bodyflooring. This plat-f 0 r m constructionwas employed in or-der to minimize thedamage to the carbody and under-framing in the eventof collisions, and ithas proved entirelysuccessful, for inthree severe col-lisions the platformshave been the onlyparts damaged ineither car. The steel under-. July i, 1911.] ELECTRIC RAILWAY JOURNAL. 15 frame weighs only 3140 lb., but it is very rigid. Assum-ing a maximum load of 160 passengers, the uniformly dis-tributed load on each sill is 33 lb. per inch of length. Thediagram on page 13 shows the deflection of a completeunderframe under a test load of 82,000 lb., which is equiv-alent to lb. per inch per sill. With this load the max- Rabetted Boards, 3fX(iGutter Rail,
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