manganese frogs and tie length

nw-mailing-list at nw-mailing-list at
Tue Dec 6 20:10:53 EST 2005

manganese insert frogs have been more or less standard for US mainline
railroad use since approximately 1910. Standard tie length is 8'6" for most
railroads a notable exception was SP using 9' perhaps due to their proximity to west
coast forests.

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