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As it was explained to me, the advantage of outside-hung brake beams is ease of access to the brake shoes for replacement (you don't have to reach inside the truck). The disadvantage is that if the brake beam falls off, it falls on the rail and has the potential to cause a derailment. The inside-hung brake beam sticks through the "holes" in the sideframe and simply falls down to the bottom of the holes and rests there. <br /> <br />Seems all a bit excessive, doesn't it, but the whole point of a freight car is to be incredibly reliable, rugged, easy to maintain, and foolproof. As example, the principal components of the truck itself -- bolster, two sideframes, two wheelsets, four bearings -- are held together by gravity.
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