The first was a short coal and goods hauling railroad that ran between Oneida and Jamestown, Tennessee.
It was prosperous during the 1920s, hauling coal and lumber and provided groceries and mail to residents along the O&W in the remote gorges and hollows of Scott and Fentress counties.
In the 1970s, the Shamrock Coal Company was having trouble with its primary hauler, the Louisville & Nashville, unable to supply empty cars fast enough to meet demand.
These were run as L&N-trains by L&N crews, but gave Shamrock lower rates for transportation and a guaranteed supply of trains/cars.
The coal was exclusively sold and hauled to a South Carolina Electric & Gas power plant in Wateree.