"Roland Perry" wrote:

How about the big tunnel machine that was used to build the Waterloo and
City line, then abandoned somewhere in the vicinity of Bank station,
then rediscovered when the station was modified to accommodate the DLR,
and which you can now walk through on one of the new connecting
corridors.

That's one I hadn't heard about before. How obvious is it that you are
inside it?


Strange that you hadn't heard of it - it was mentioned earlier in the
thread! (Mark Brader and Paul Corfield referred to it.)

Calling it a "big tunnel machine" is probably overstating it somewhat,
though. It is the original W&C Greathead Shield, but there is no machinery
there - just the shield itself (ie a red-painted metal ring, a little larger
than the main tunnel), which you walk through. It is located in what was
one of the W&C over-run tunnels at Bank, which was converted into the
pedestrian link to the DLR in the early 90s.



"David Splett" wrote:

There's another tunnelling shield visible at the end of the over-run
tunnel at Moorgate Platform 10.

That is perhaps more interesting, as it seems to still have some framework
inside (although this is a little difficult to make out). I *think* that
the item on display at Cutty Sark & Maritime Greenwich is a proper Tunnel
Boring Machine (complete with "teeth"), but I could be wrong.

The Greathead Shield that was used to build the Rotherhithe (road) Tunnel is
also still on display. One half of it forms an archway over the approach
road at one end, with the other half similarly at the other end. The
southern approach is but a stone's throw from Rotherhithe station.



--
MetroGnome
~~~~~~~~~~