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Is the two second rule the design standard that says (geometrical) element lengths should be no less than 2 seconds at line speed?
A lot of the national network doesn't achieve that either and over point work it won't apply as you're constrained by S&C geometry.
I've not heard a definitive...
Housing development on the other side of the Medway.
The satellite image in the original post is a little old - Peter's bridge is now complete.
EDIT: Just spotted it's a very old thread!
Back to the original question, I'm reliably informed that there's signalling/level crossing commissioning that has caused some delay to the station opening.
There are level crossings either side of the station both currently AHB (Automatic Half-barrier). One will be converted to an MCB...
Group standards require the following - max 275mm horizontally, 230 vertically and 350mm diagonally. But invariably this isn't achieved everywhere for all rolling stock.
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It's now in GMRT 2173. RSSB Standards send me round in circles!
They're usually yellow (but might just be the cab ride video quality) but I'd agree they're cant markers.
Many in a line indicate a cant transition - increasing to a constant cant (where the last marker indicates) into the long continuous curve through Insch.
Here's a photo looking in the...
Route plans for Birmingham section are here.
https://www.gov.uk/government/publications/hs2-plan-and-profile-maps-post-house-of-commons-select-committee-2016-west-midlands
The Curzon Street terminus is north of Liverpool Street so it won't be the new line.
Quick search on Google comes up with...