<Ul> <Li> The original single line Gib Tunnel near Mittagong was replaced with a double - track tunnel, with the original tunnel used for growing mushrooms . </Li> <Li> The 1832 double - track mile - long tunnel from Edge Hill to Lime Street in Liverpool was near totally removed, apart from a 50 - metre section at Edge Hill and a section nearer to Lime Street, as four tracks were required . The tunnel was dug out into a very deep four - track cutting, with short tunnels in places along the cutting . Train services were not interrupted as the work progressed . There are other occurrences of tunnels being replaced by open cuts, for example, the Auburn Tunnel . </Li> <Li> The Farnworth Tunnel in England was enlarged using a tunnel boring machine (TBM) in 2015 . The Rhyndaston Tunnel was enlarged using a borrowed TBM so as to be able to take ISO containers . </Li> <Li> Tunnels can also be enlarged by lowering the floor . </Li> </Ul> <Li> The original single line Gib Tunnel near Mittagong was replaced with a double - track tunnel, with the original tunnel used for growing mushrooms . </Li> <Li> The 1832 double - track mile - long tunnel from Edge Hill to Lime Street in Liverpool was near totally removed, apart from a 50 - metre section at Edge Hill and a section nearer to Lime Street, as four tracks were required . The tunnel was dug out into a very deep four - track cutting, with short tunnels in places along the cutting . Train services were not interrupted as the work progressed . There are other occurrences of tunnels being replaced by open cuts, for example, the Auburn Tunnel . </Li> <Li> The Farnworth Tunnel in England was enlarged using a tunnel boring machine (TBM) in 2015 . The Rhyndaston Tunnel was enlarged using a borrowed TBM so as to be able to take ISO containers . </Li>

What is the difference between a hole and a tunnel