Usually to use cheaper rail. One advantage of doing this on a
model is it is easier to keep the rust colored paint on the top of
the guardrails intact when you clean your running rails.
I built a bridge for my last layout with Code 70 running rails
and Code 55 guard rails. This was in Sn3 so the rail sizes were
smaller, but I still would go one rail size down for the guard
rails.
I have had success using ACC to glue an additional rail to
flextrack. I did it on my old layout where I already had a
standard gauge siding that I changed to S/Sn3 dual gauge and
it lasted for several years until I moved. There shouldn't be
much stress on a model guard rail so this should work for those
that want to use flextrack on bridges.
Dave Heine
Easton, PA
I believe that guard rails are typically a lighter weight than the
running rails. I wonder if there is a functional reason for this,
or
whether the railroad was just using up older lighter weight
rail.....
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