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More likely to be used by Network Rail and contractors working on the railway in the tunnel due to the available cross passages that give access to the main tunnel.
On major relay work a one way system was set up with selected vehicles only parked in the tunnel and a shuttle back to the main vehicle park at either end of the tunnel.
The "Cathedral" in the centre of the tunnels allowing a short circuit to turn round.
The canal is actually below and between the Running and disused Down tunnels.
When the canal tunnel was first reopened, boats wishing to pass through had to be towed by an electric tug, with three or four boats tied in line behind it. The tug had seats and if you were at the tunnel mouth at the appropriate time you could pay to go through as a foot passenger. I've done it twice. The backup vehicle travelled along one of the unused railway tunnels so as to be available to evacuate people from the canal if necessary. Travelling west to east the vehicle was driven in reverse, which must have been a difficult experience for the crew. At intervals the vehicle crew and the tug crew exchanged signals with torches through the cross passages, to confirm that everything was normal.
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