The mechanism of this side-dumpinig car consists of truck 1 and body 2 connected together by six-bar linkage ABCDEFG (see left-hand drawing). When link BC is turned clockwise, body 2 begins to overturn. At this, link 3 first moves slowly since link 4 bears on pin d. As soon as lug b engages pin c, link 3 is raised. Then the body is dumped and takes the position shown in the right-hand drawing.
$829$LW,MH$