It's a US film, I think from the 70s.
I think the protagonist is a sales man; he stops his car for help because of a blizzard, although he might have crashed it.
The antagonist at first appears nice then beats the younger man and uses him as a slave.
The young man and the daughter form something of a bond.
The daughter throws herself in front of a train at the end of the film out of fear of the 'outside world'.
I thought the title has the word 'bitter' or 'winter' in it.