I went to Catholic school in the mid-60s. For the life of me, I can't remember any rule not to talk. But we DID go outside, no matter what the weather!
We also walked to school, no matter the weather.
Of course, there were no sex predators every other block....
I remember reading children's stories and wondering how the kids traded their lunches in the stories. It took me a while to realize that of course, they could speak!