sentences:  One of the horizontal tunnels departing from the tunnel at this point used to run to the Butterley Company's Butterley Carr Pit which opened in 1812 and loaded its coal directly into narrow boats at the underground wharf.There were also vertical shafts from the wharf which allowed goods in tram boxes to be lowered directly from and lifted up to the Butterley Company's works (on the hill above the tunnel) to and from the underground wharf.These tram boxes were used by Benjamin Outram on the Little Eaton Tramway.