poem question

A couple of years ago I came across a poem somewhere on the interwebs. I cannot remember where or what it was called or who it was by. I think it was by a woman, and wherever it was posted, maybe it was mentioned that it was from some poetry journal, some years ago? The poem was based on a true story, I think? (or maybe a newspaper article of a story?)--it was about children somewhere rural, going somewhere, or coming home, and a little boy getting somehow trapped/stuck on the train tracks, and his sister tried to help him, and a train was coming, but when she couldn't help him get free, she hugged him and stayed with him, and they both died.

Does anyone know this poem, or where I can find it?