What is the history of treating wood ties?
Treating wood ties in the US began in earnest in the early part of the 20th century. It took several decades for them all to be treated. In fact, our records show that in the 1940’s approximately 10% of wood ties were still untreated. You may see the history of Class 1 wood crosstie insertions since 1921 at http://www.rta.org/Portals/0/Documents/Research%20Paper%20&%20Articles/Historical%20Wood%20Preserving%20Documents/Class%201%20Insertions%201921%20to%20Present.pdf.
