Question

Because the Jews had become so skinny they could fit 300 per boxcar on the train

Answer 1

This is true :)))))))

Answer 2

This is true. in the book "Night", by Elie Wiesel, Wiesel shares his experience. This scene is actually part of his experience.

"They fit us into the cars, 300 per cars, we were so skinny!" 

Hope this helps