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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...

It looks about 50 years old and rusted to the track. Don't think much was done to P7 in the 2001 works. Buffer face not compatible with the Class 195 and needs work doing to the deck behind it so it slides correctly on impact

4m extension and relocation of the signal. To allow 4 cars Class 195s. Civils work should be underway now. Bit of rejigging of insulated rail joints and signalling kit. Commissioning to be done at Christmas. Buffer stop to be replaced at some point too but not until next year.

Christmas Day by my reckoning!

Good progress...but the rate's going to have to increase rapidly if they're aiming for completion in 3 years.

The M61 crosses the Wigan-Bolton line too but the parapet is already clad - Whether it meets requirements for OLE I don't know. M61 overbridge before cladding on the line to Preston:

Ooops!

That wasn't the gist I got from my skim through the postings, just that "new surveys" would be required without really contemplating what that entailed.

The track can move (or be moved) more than few mm. A track renewal, for instance could have positioned the track even further away from it's surveyed position than a maintenance tamp. Yes, there are maintenance allowances built into the wire height and track position, but one shouldn't be eating...

^^^^ Yes, that - not corrugation. Presumably cyclic top might not be apparent at certain speeds that don't cause the train to resonate so wouldn't always get flagged by the crew.

If it was resulting in lots of shaking and rattling (rather than sudden jerks or excessive carriage sway) then it could be down to rail corrugation rather than poor track alignment geometry.