The B&LE main line divides around Greenville, between a waypoint north of the Village of Osgood called 'KO' and another waypoint near the Village of Kremis that used the telegraph call name 'KY', for the "Osgood-Kremis" cut-off ("K-O") that joined the original "Old Line" there. The latter still winds down along the Little Shenango and Shenango Rivers into downtown Greenville (where the B&LE shops are located), and then climbs back up to Kremis, en route to Fredonia and North Bessemer. The B&LE constructed the shortcut K-O Line in 1901–02 to bypass the steep, winding route through Greenville. From 'KO Junction', it runs south over a long () viaduct above the Little Shenango River, the original B&LE Old Line, the former NYC RR's JF&C Branch and the former Erie RR's Chicago—New York main line at Osgood. It then passes east of downtown Greenville at a relatively high elevation, and rejoins the original line at KY, near Kremis. The K-O Line cut-off shortened KO to KY run by 3.1 miles vs. the Old Line. Except for the Osgood Viaduct, this cut-off was double-tracked for many years but, since the arrival of CTC signaling in the Fifties, is now entirely single track.