I have always been into MOW equipment,
ballast regulators, Jordan spreaders, etc. Couple of pics from local area.
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Maybe they have the concrete tie technology figured out now (fibermesh, proper reinforcing, etc.) but when they first came out with the idea in the 70's I remember them having problems with the ties cracking and coming apart.
Around my home, the previous owner installed used RR ties at various locations for landscaping, etc., and the ones he used were some kind of recycled tie. Apparently they tried running old ties through a big
chipper, then gluing the chips back together around a stick of wood to make a new tie, similar to making OSB. This must not have been successful, because I have never seen them in use, and the ones around here have mostly disintegrated.