They should also be responsible for resurrecting people who died and compensating them for the time they missed, and unpolluting hopelessly polluted sites before they were hopelessly polluted.

At the end of the parable of Job, God gives Job all new sons and daughters to replace the sons and daughters that were crushed during the game with Satan. I never considered that as a thing that made Job whole. In case of devastating and prevetable disaster, the train companies will just declare bankruptcy and the owners will start new train companies, or they'll nationalize themselves and sell to the government at an inflated price.

edit: these companies were all formed by groups of insiders that were handed state property for free; they have typical post-Soviet oligarch origin stories.