ForkTrain -the gloom traveller-

Main character has been travelling alone his whole life. In a rural town he finds a deserted station building. Surprisingly, there are two people inside, and train arrives soon. Train does not have clear destination, so protagonist boards it out of curiosity. After a long tunnel passengers appear in another world without morals applying to love, hate, life and death. Abuse, rape and death govern this place.

[From vndbreview]