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Possibly this system is being used:

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...

That's the headline-grabbing figure but what about all the other roles matacaster listed?

Can you provide some figures for these roles? Otherwise it's a baseless argument.

An aerial view of the North connection works at the top of the page with the depot on the right.

Bedford (MML) has a platform on the Down Fast but not the Up.

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. 1681204292 It's now in GMRT 2173. RSSB Standards send me round in circles!

NR60 Mk2 H (32.365 - 34.5. Not sure on the Xing angle adopted) was being developed a few years back

Yep - It pays to have friends in high places!

Judging by the 0.442km marker on the end of the international platforms, I'd imagine it was the buffers on Platforms 5-10

Here you go: I had a quick skim through and could only see 2.46miles of level track.

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...

The cutting head has a bigger external diameter than the internal diameter of the concrete rings that get placed behind it as it advances forward. 1638551063 Should have read "Bore" - Not "bite" - Well done for deciphering my cryptic code.

Both? Is this not where the same TBM will be partially dismantled on completion of the first bite and transported back to do the second bore?

Probably rats :D

Looking like 4 years of tunneling at this rate. At this rate it'll be 4 years of tunneling to complete.

The 101m will be the physical length, measured from the buffer face to the top of ramp but has an operational length of 95m due buffer stand back and anti-trespass/platform end gate gubbins. The platform end fence (as it was before works started) could have been relocated to provide additional...