Thread: Heathrow Express slashes fares (so it says!)
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Old November 17th 19, 08:33 AM posted to uk.transport.london
Robin[_6_] Robin[_6_] is offline
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Default Heathrow Express slashes fares (so it says!)
On 17/11/2019 09:08, wrote:
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?

I don't know for a fact when and why that was done for the tube but
shifting the zero on a scale was a recognised way of reducing the scope
for errors such as a typo that omits a "-" or a reader missing a "-";
and -13.2 minus -17.4 resulting in -4.2. Especially before VisiCalc,
SuperCalc etc.

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Robin
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