I love Phildizzy's jokey response so much, and love it even more that Brynnda agreed.
I also love that Brynnda hasn't "seen this movie in a long time" but feels compelled to respond on a brief meaningful scene.
Hahaha, well played IMDB; I love you
By the way, 2nd Poster is correct.

I would agree with that, Phildizzy. I haven't seen the movie in a long time, but i remember him having this really resentful/angry look on his face while he was looking out at the trains as a boy. I think he resented the sound of that train going by his house so much that he decided to kill those responsible for the trains going by- the Carlson family.

I asumed it meant he was so fed up with hearing those trains run by his house all day, so that he decided to kill the person responsible for it, beeing the girl's father. Bu then he comes up with the plan of killing his daughters instead, so that he will have to suffer.
COWBELL SOLO

Jonathan is looking out at the freight train because the train is identified on the side as belonging to the the multimillion copper company, towards which he would later plan his path to success, (by marrying into the family that owns the company, and ingratiating himself to the patriarch, and work for him.) It symbolizes Matt Dylan's character (as a boy) as a highly ambitious social climber, born on "the wrong side of the tracks" but determined to change his fortunes. So it is ironic that it is the same train that destroys him, morally, and literally when he's run over by it in the end.