Kingsport Subdivision

The Kingsport Subdivision (also KP Subdivision) is a 133.2-mile (214.4 km) railroad line owned and operated by CSX Transportation in the U.S. states of Kentucky, Virginia, and Tennessee. It was formerly part of the Huntington West Division. It become part of the CSX Florence Division on June 20, 2016. Running from Elkhorn City, Kentucky south to Erwin, Tennessee, it forms the north half of the former Clinchfield Railroad; the south half, from Erwin to Spartanburg, South Carolina, is now the Blue Ridge Subdivision. From Elkhorn City, the line continues north as the Big Sandy Subdivision to Catlettsburg, Kentucky on the Ohio River; trains can then continue to Ohio and other Midwest points. From Spartanburg, trains can continue to Georgia, Florida, or other Southeast states.

The line begins at Elkhorn City, Kentucky, at the south end of the Big Sandy Subdivision. It continues southeast alongside the Russell Fork of the Big Sandy River through Breaks Interstate Park to Haysi, Virginia. The line uses the valley of the McClure River from Haysi to Nora and McClure Creek from Nora to Trammel. Between Trammel and Dante, the line crosses under the Sandy Ridge (Tennessee Valley Divide) using the Sandy Ridge Tunnel.