By the nature of traffic, i.e. longer pauses between trains, a normal rail line in the temperate climate zone is less bisecting habitats. High-speed lines with fences along the tracks are another thing, though the longer tunnel stretches than on highways mean reduced impact.

Interestingly, a problem reported from Sweden is that trains hit a lot of elks who insist to squat on the tracks, presumably because there are less mosquitoes in the sunshine.

_{*Lunatic*, n.
One whose delusions are out of fashion.}