| Re: The Second Severn Crossing's monorail: main span walkway + a pylon. Posted by stuving at 00:13, 4th August 2026 | ![]() ![]() ![]() |
There's also a monorail in at least one of the national grid electricity tunnels under London. The main reasons are the distance and lack of access shafts, and saving of time. There is an IanVisits article about this.

One thing I have never found out is whether this has any use for pulling new cables into place when a cable is to be added or replaced. And I expect there are similar things hiding in other big bits of linear infrastructure.
| Re: The Second Severn Crossing's monorail: main span walkway + a pylon. Posted by Oxonhutch at 20:51, 3rd August 2026 | ![]() ![]() ![]() |
To parody the 'A' Team (remember them?), it's great when a plan doesn't come together.
| Re: The Second Severn Crossing's monorail: main span walkway + a pylon. Posted by ChrisB at 19:03, 3rd August 2026 | ![]() ![]() ![]() |
which you won't get back ever!
| The Second Severn Crossing's monorail: main span walkway + a pylon. Posted by Mark A at 18:14, 3rd August 2026 | ![]() ![]() ![]() |
A 30 minute watch...
https://www.youtube.com/watch?v=SzM1hpnXux4
Mark














