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Re: RR Tie retaining walls

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The NDS has allowable stresses for "poles" for different species of wood.  The
railroad ties will be a little mor difficult to get allowable stresses for,
but you could assume a conservative value or find out the species and make
some assumptions from there.  I have designed these walls before and found the
contractors have been very surprised at the foundation requirements.

Good luck.

Brian Dunagan, P.E.