Bit outside my usual MIB territory but this actually caught my attention because there's a pattern here that feels familiar to other high-strangeness locations. Old infrastructure tends to accumulate reports. Railway lines, old mines, decommissioned military sites - they all seem to act like magnets for this stuff and nobody really has a satisfying explanation for why.
My gut (and I know how this sounds) is that its less about the railway itself and more about what the railway was built through or over. A lot of Victorian-era lines were routed through ancient woodland corridors, valley paths, places that were already considered "off" by locals for centuries before the trains showed up.
So are you seeing Dogman specifically near active stretches or more the abandoned sections? Because I'd bet money the abandoned ones have significantly higher report density and that probably tells us something useful about whether human activity suppresses these encounters or just moves them along the line.
Would genuinely like to see someone map this properly. The data is out there if someone bothers to pull it together.