What about Alida Valli in the end? (spoiler)
I've always found extraordinary when Loren, Gardner, Stander, Valli, Lovelock and Turkel all leave the dining car because of the gas and cram themselves into the same second class compartment trying to escape the blows of the shooting. It's curious to see that quick parade of stars blatantly closing themselves together into a small space.
Anyway I've never figured out what really happens to Mrs Chadwick (Alida Valli) since she doesn't show up anymore from that on. Do the guards kill her or severly injure her?