The Cafeteria - Waiting Room was where it is indicated on this photo, both my grandmother and mother worked there. In fact my grandmother worked there until the day it closed. I have the same photo that Mike Jenks posted and the first time I saw it I though the woman in the photo might in fact be my grandmother, but on closer study I see that it is not her hair is much darker and she always wore a hairnet and hat whilst serving in the cafeteria.
Same scene a few moments later: