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The RR tracks run along Rt32 near Peebles and the W farm, eventually crossing Rt32 and turning southeasterly toward Rarden. Other posters have said it would be easy to use the tracks, get on the power line right-of-way, and come out very near KR's. Pretty sure they said the power lines are right by KR's. That route may also involve the rest area and the trails beside it.
A rail or utility line route would be too circuitous and difficult to navigate, especially when it was time to leave the tracks. Any kind of AWD vehicle used there would be very noisy and attract attention from neighbors in the middle of the night, JMO.
I was wondering if they used hidden cams, scanners or some diversion to keep LE out of the area that night.