633 LOCOMOTIVE ENGINES . axle box , the whole weight is taken on the top , the spring - bearing pin resting on the cast iron , a boss with a part cast out or bored out being left on , forming a step … side , the pin for taking the Fig \ 507 . — Brass Axle Box with Wrought - iron Strap . spring shackle passing through a , Axle box . b , Strap . c , Shackle . the strap . Wrought - iron axle boxes have been used ; they are of course much strenger , but they do not wear so well as the cast - iron…
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