I've sometimes wondered about moose and trains. Some of these animals weigh upwards of twelve hundred pounds --- sufficient, I would think, to do fairly significant damage to a locomotive, if not derail it. I've never heard of such a thing happening, however.
My most memorable wildlife encounter while hiking up a cinder embankment to check out a former Lackawanna ROW about 10 miles north of the Tunkhannock Viaduct. There we had a surprise encounter with black racer snakes resting in the morning sunshine.
A buddy and I stepped over them in the low brush during the climb up both thinking they were discarded black hose tossed off for scrap. When we finished taking pictures and prepared to cross over the hose again, there was movement and 2 heads become apparent in the mix. What a thrill. We found another way down the hill to our ride that didn’t involve bushwhacking.