sentences:  In 1973, Koester relocated to Stillwater, a town in northern New Jersey to take a position with Carstens Publications as editor of "Railroad Model Craftsman".It was during this time that he developed a close friendship with Jim Boyd, the editor of Carstens' "Railfan & Railroad".It was Koester's exposure to eastern mountain coal railroading in the Appalachians that led him to develop the concept of the Allegheny Midland.