Originally Posted by
Waterways
Just inside the main tunnel there is clearly and arched tunnel portal that look like it is going east. What is that? The start of a tunnel that was abandoned?
Its probably the heading/flying junction that was constructed during the building of the loop & link to enable a connection south of central to one or more of the disused tunnels so the northern line could run to edge hill with extra underground stations along the way.
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Martin S knows more than me. Its a relatively hidden and unknown part of the system, same with the header built between hamilton square and James Street for a connection to the docks.
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