What types of wood are used for crossties?
While there still are some softwood species used for crossties and bridge ties, the vast majority of species utilized today are hardwood species. The mix of species depends on the application and locale of sourcing, but a good rule of thumb is 50-60% oaks and hickory, and 40-50% other mixed hardwoods. The complete list of allowable species is available in the TieGuide (see above) and the RTA Specifications brochure.