I just think that if the scent ended there, that's the only possibility. I would hope the police did check that. I'm not sure about that area, but my area sometimes those containers on the tracks sit there awhile. I'm curious if anyone even goes and checks those containers. I'm sure eventually they do. But here, those containers go to the terminal where they are then loaded and shipped by water.
The other thought, which is absolutely repulsive, is that the baby was ran over by train, but I am positive there would be evidence of that left behind.
I'm grasping at straws, I know, but it just breaks my heart.