In message , at 14:26:06 on Sun, 17 Nov
2019, Clive D.W. Feather remarked:
In article , writes
On Sat, 16 Nov 2019 16:19:01 +0000
"Clive D.W. Feather" wrote:
Based on a 2015 FOI request, the following platforms are at least 15
metres below sea level (numbers are metres above LU datum, which is
exactly 100 metres below the OS datum at Newlyn):
*Above* the LU datum? Why did they choose something so deep as a base point?
So that all the numbers are positive. They could have used 50 or 30
metres, but this way they're unlikely to ever need to change it.
Similarly the Eurotunnel zero point is around the 63 milepost west of
Westenhangar, rather than at the concession boundary.
74.0 Waterloo (Jubilee)
84.4 Bank (Northern)
Looks like the actual deepest railway platform in London is a toss up between
jubilee waterloo and Bank DLR which is way beneath the northern line
platforms.
Anyone know how deep the DLR is?
74.20 metres LU datum.
Hmm, that puts it less deep than Waterloo, and contradicts a general
online consensus and my own arithmetic (where have my ~2.5m disappeared?
Other platforms below sea level a
Beckton Park 99.96
Cutty Sark 86.05
Cyprus 99.98
Island Gardens 94.94
The greatest distances below ground level (which is not necessarily
measured at the station entrance)
Is that where the difference between the 41.1 and 41.4 arises?
a
Bank 41.10
Cutty Sark 18.25
Woolwich Arsenal 11.32
Island Gardens 7.16
12 other stations have platforms between 0.00 and 4.50 below ground
level.
--
Roland Perry