Nosker, Thomas & Renfree, Richard W. & Kerstein, James. Use of recycled plastics for preparing high performance composite railroad ties, U.S. Patent 6,191,228. Retrieved from https://doi.org/doi:10.7282/T38K7CGX
AbstractA method of maintaining proper distance between railroad rails is disclosed. The method utilizes railroad ties manufactured from a composite of polystyrene and polyolefin components, preferably obtained from recycled plastics. The composite exhibits a dual phase morphology wherein the two phases, polystyrene and polyolefin, intertwine and remain continuous throughout the material.