I'll accept that, but where are they being treated? Creosote treatment sites from the past are largely closed and under long-term, sometimes Superfund, cleanup. I suspect that if creosote is still used, the treatment methods must have changed, at least to reduce the amount of material used and improve how it's contained in the wood (pressure-treatment perhaps?). Modern hazmat regulations would also, probably, require centralizing the treatment so the resulting plant would have enough volume to justify spending on the containment and other safety measures required. So do railroads still do it, or do they outsource? I suspect the latter as a general rule, regardless of how they're treated (most of the creosote alternatives are pretty nasty, too).