Yes, this movie has similarities to Wes Craven's The Last House on the Left. Don't think I wasn't mentally taking note of all the parallels: two pretty girls, a couple of aggressors including another woman, rape and humiliation, murder, attackers end up with one of the girl's parents, father is a doctor, mother notices one man wearing an item belonging to her daughter, father gets revenge on attackers for daughter's murder. And just as Last House had its share of ups and downs, so does this movie - although I would say that it has a few more ups than Last House did.
Then when we finally get on the train, there are some seemingly unimportant short scenes of different passengers on the train, including the woman known only as the "Lady on the Train." I didn't find any of these points slow at all but was rather more intrigued at how this whole scenario was going to play out. The attackers' motives for tormenting and killing the girls seem to be nonexistent - like they are just doing it for fun - and that should be enough to make the audience think they deserve the harshest punishment for it, but these earlier scenes of the three of them leave a bad taste in your mouth from the beginning. These people are immoral and frankly, they suck as human beings. And apparently, so do some other people on that train...
The violence, including the rape scene, is mostly subdued. There is no nudity and all the slapping and hitting is not as bad as it could have been. Even the most brutal act in the movie - i.e. stabbing a girl in the freaking vagina - is done in a way where the focus is on the victim's pain and the horrific look on her face during her eventual death, giving you more reason to hate these loonies. The revenge that the father takes on the harmonica-playing baddy is actually rather silly and not that satisfying, though. Nor is his chasing the other guy around with a gun for a while before finally fatally shooting him off-camera. NOR is the fact that the most vile one of the group, the woman, gets away with it all in the end. That probably pisses off everybody who watches this movie.
Harping on a few bad things, though, won't really make me reconsider my initial reaction to Night Train Murders. I like it. It is well shot and directed, and does not show anything all that explicit to titillate any viewers who may just root for the bad guys as I know some of them do. The acting is pretty good, I guess, but it's always hard for me to judge somebody's acting when they're being dubbed over so horribly.