Penna. NG question

Recently I acquired a copy of "Bells & Whistles in Old Perry," which chronicles the life and times of the standard gauge Susquehanna River & Western and the narrow gauge Newport & Shermans Valley. In later years, the two lines shared a common yard in (New) Bloomfield, Perry County, Penna. I have carefully inspected each photo in the book, and I have carefully looked at the track diagram of the area. My question is this: how did either railroad run around its train at this point? There is no evidence that either railroad had any true three-rail switches, and the dual gauge track seems to be laid so as to avoid any extra frogs. I've also looked at photos in another book "Perry County Railroads," but have had no further revelations. It would appear from the topography that the N&SV could drop its train by the engine, but that same grade would preclude the SR&W doing so. Anybody have any thoughts?