The Charlotte Running Track, locally known as the Charlotte Runner or the Charlotte Branch, is a CSX Transportation-controlled branch line located in Rochester, New York. The track is roughly nine miles in length, beginning at control point 373 on CSX's Rochester Subdivision and snaking north through the residential and industrial sections of Rochester's west side before turning to the west in Charlotte onto what was the Hojack Line, terminating just to the west of Rochester Gas and Electric's Russell Power Plant in Greece.
The Charlotte Runner branches off of the CSX main at CP-373 via a wye that allows access from either the west or the east. Heading north, the line passes under Interstate 490 before reaching a switch that leads to the Falls Road Industrial Track, the lone remaining remnant of the Conrail Falls Road Secondary in Rochester. Just past this switch, another split on the line heads east to the former New York Central mainline trackage, which is no longer used due to the lack of customers following the closure of the Kleen Brite chemical company in 2004. Meanwhile, the Charlotte Branch continues to the north toward Kodak Park.
North of Driving Park Avenue, the Charlotte Runner parallels the Rochester and Southern Railroad. The two lines follow one another into Kodak Park, the gigantic industrial complex run by Eastman Kodak and maintained via an intra-plant railroad. Just north of West Ridge Road, the KPRR interchanges with both tracks. The RSR and the Charlotte Runner then turn to the northeast for a stretch before the RSR turns to the north while the Charlotte Runner continues northeast, following the path of the Genesee River.