Chapter 4. How does Dally know about this hideout for Pony and Johnny?

We are not told how Dally knows about the abandoned church in Chapter Four. The only mention Dally makes of the church is as follows;

"Hop the three-fifteen freight to Windrixville," Dally instructed. "There's an old abandoned church on top of Jay Mountain. There's a pump in back so don't worry about water. Buy a week's supply of food as soon as you get there--- this morning, before the story gets out, and then don't so much as stick your noses out the door. I'll be up there as soon as I think it's clear. Man, I thought New York was the only place I could get mixed up in a murder rap."