Bob Werre asked about the usefullness of guard rails on bridges. Two people
got the answer correct, Paul Vaughn and Dave [NLM]. The rest of the
responders continue to discuss something quite different.
Those rails you see between the principal rails on a bridge are not for a
little narrow gauge railroad they might put in someday, and they do not
serve to keep the wheels on the rails. They are there only in case of a
derailment, to keep a bad situation from becoming worse. If a car derails,
say, to the right, the left wheel is restrained by the left guardrail, which
keeps the left wheel, and thus the entire car, from moving even farther to
the right and maybe into the side of the bridge, or falling off the bridge.
If you've ever seen a real railroad bridge, you know the distance between
running rail and guardrail is much more than just flangeway. I have seen
scale model bridges built with only flangeway between running rail and
guardrail, obviously built by someone who didn't understand.
Guardrails at frogs are an entirely different matter.
Tom Hawley -- Lansing MI
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