Has anyone had any experience with plastic railroad ties for hardscape borders or retaining walls? I'm pricing a job where the homeowner wants to use ties on each side of a gravel drive to define the driveway. At this time he is opposed to concrete, blacktop, or other hardscape choices since the driveway itself aids in water drainage. Plastic railroad ties are made from re-cycled materials and are available in several colors. They are somewhat expensive, but uniform in width so they would match up very well. I've priced them undelivered from about $50 to $100 for standard eight footers. They can be drilled and spiked/rebar nailed just like wood. They do not rot either. Here are some sites to check out: http://www.americanrecycler.com/10ties.html http://www.progressiveengineer.com/PEWebBackissues2004/PEWeb%2051%20Jun%2004-2/51comp.htm I'd be interested in what you think about these?