Thanks, daveo & Chessie Dispatcher, for the information. The Sanborn map shows a bit of what must have been POAN track south of M-142. I'll have to look for evidence of ROW next time that I'm in Bad Axe.

Do you know when the Pere Marquette line south from Bad Axe was abandoned between Croswell & Port Huron? That would be an interesting ROW to trace.

Thanks again.