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The Loops on the CSX, formerly the Clinchfield Railroad, ascends and descends the Blue Ridge in McDowell County, North Carolina. The picture is from inside the Bird Ridge Tunnel, looking through the Lower Pine Tunnel to the Speedy Tunnel; there are three tunnels all in a row.

The Loops on the CSX, formerly the Clinchfield Railroad, ascends and descends the Blue Ridge in McDowell County, North Carolina. The picture is from inside the Bird Ridge Tunnel, looking through the Lower Pine Tunnel to the Speedy Tunnel; there are three tunnels all in a row.