In Pawn by Ellis Parker Butler

"Now, don't you go an' let on to your Aunt Sue, Lem," Harvey told the boy that night when Lem came begging to be taken back. "You just keep your mouth shut, an' in a week or so you come to Burlin'ton an' hunt me up. You won't have no trouble findin' where the post-office in Burlin'ton is, an' when you git there you go to the window, an' ask if there's a letter for Lemuel Redding. It'll tell you where to find me, an' then you come to where it says."

"I'd ruther go with you," Lem said wistfully. "I ain't ever been on a train. I don't know how to do on a train."