movie or show scene with mentally disabled young man with a wooden doll getting run over by a train

It is a very disturbing scene that has stuck with me since I was a kid. I think the young man lived in a home for developmentally disabled kids, and he always carried a small dark wooden doll that was not unlike a poseable manikin doll, around 8 inches tall or so, but floppy at the doll’s joints, not rigid.
There is a scene where he is running along a train track at night, and for some reason he runs in front of the train. The next scene shows adults on the tracks with flashlights sadly covering his body with a sheet, you dont see any of the body or gore of course.
Would love to know what movie or show this scene is from.