According to the C&S Tiem and Timber Spec's book, Quote:
"The following varieties of timber will be accepted for Narrow Gauge ties
1- Red spruce
2- Yellow Pine
No White Pine, Whie Spruce of Balsom Fir wil be accepted. No ties will be accepted cut from burned or dead timber, except Pinon in good condition, which will be accepted if tied fill allother reqirements in the specifications
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All ties must be (6) inches thick, (6) inches wide on the face and (6 1/2) feet long
ies hewn n all four sides, and also sawed ties muct be (6) inches thick, (6) inches wide and (6 1/2) feet long.
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And it goes on for 21 pages.
Rick