I've been dying to re read this one, but my Google skills fail me.

It was a hurt!Sam fic set mid series, maybe season 6, 7, or 8? Sam was driving to get dean something or whatever andhe pulled up at a stop light. He sees behind him a bus of kids is stuck directly on railroad tracks, the barriers somehow malfunctioned and the train was coming, so sam made a calculated decision to run the red light, into a dangerous intersection, so that the bus could pull up, thus saving the kids.
Pretty sure there were like low self esteem / suicidal!sam aspects too.

Also any similar hurt!Sam suicidal/low self esteem car crash fics would be soooooo appreciated :)