Don't know about worst, but the most disturbing was the string of about 12 baby carriages along the Santa Fe near Pittsburg, CA. They had obviously been placed on the tracks and been hit at high speed. It was disturbing because, as my buddy who was with me commented, "each one we find there's a better chance there will be a baby in it". We did find one with an animal carcass in it. Just kept imagining the horror of the crews coming into view and seeing a baby carriage in the middle of the tracks. That had to have some pucker factor.