Included in the design of "new" yard construction was
a "bowl". Older yards were not so blessed. The tracks
were laid, for all intents and purposes, as topography
dictated.
Many (most) old yard tracks demanded the use of
handbrakes to prevent cars from rolling out or back.
As one of the larger yards west of Chicago, Eola was a
prime example of laying tracks with no particular
interest paid to the "bowl" effect.
Both east and west Eola yards had tracks that demamded
attention to roll-out. If one became careless one
would find recently "kicked" cars waiting for them on
the lead. This often led to problems.
Hump yards required bowels since they were designed to
operate in the absence of "field men" thereby
eliminating the presence of switchmen to apply
handbrakes.
Hope this helps.
Karl
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