There is a general problems with elks (for americans, please note that this is European elk, or what you call moose) and traffic in Sweden.

I would say that the problem is less for rail then cars though, or at least much less human casualties are reported from rail accidents. I guess the engine manages such a collision without much trouble. In the case of cars, the car often hits the elk at the legs, tipping the body so it crashes through the windshield, killing both elk and humans (male elks can weigh up to 700 kg). There has been different attempts to solve this by steering the moose to safer passages. Synthesized wolf urine was used in one large scale experiment, I do not think it worked out though.

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