Comment by jacekm

Animals on tracks remain a problem, although they do not pose risk to human life (just damages to the trains). One of the attempts to protect animals include acoustic deterrents, here's a Polish one as an example [1] but they are manufactured around the world. The Polish one plays sounds of predators, dying creatures, hunting dogs, etc to scare away forest animals (search for "UOZ-1" on youtube if you want to hear the sounds). Such devices significantly lower the number of collisions but unfortunately they are not 100% effective.

[1] https://www.youtube.com/watch?v=W0j68iepI88