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Since they have no leaves at this time of year, I would say that they are deciduous. As for species, some type of maple perhaps?

The fill material is probably so called Type 1 or Type 2 aggregate as described here. Although defined for road use, no doubt similar specifications apply to rail. Source Base layer materials As stated above, it is usually comes from any source of granite and is pink in colour before it...

According to the Borehamwood & Elstree Times http://www.borehamwoodtimes.co.uk/news/14097626.TFL_puts_forward_extra___2_7million_so_Croxley_Rail_Link_construction_can_start_next_year/

Looking at pictures 5378m and 5378k taken on 16th November, I don't see any evidence of the tunnel invert being concreted. This task must be running later than expected.

I second that. Many thanks Dave.

Great stuff. Thank you Dave and Joe.

The use of stainless for dowel pins is quite probable. However picture 5228r shows that the parapet is nowhere near ready to accept the anti climb coping stones, so the dowel pins are not yet an issue.

I think this is mistaken. I am not aware that stainless steel reinforcing is used in general construction. In a nuclear reactor perhaps, but not here. Re: The Cemetery Road bridge parapets. Were they ever there? I was aware that pre-fabricated parapet sections were dropped in by crane...

Judging by the above responses he is unlikely to be of much use. Educated as an economist, he is what rail doesn't want or need!

I understood that his claim to fame was primarily Crossrail. But Crossrail isn't finished and as we saw with the Channel Tunnel, completion of tunnelling is a very different thing to creating a fully functioning operational railway.

Looking at the quality of the brickwork in the arch and the voids behind, it is amazing that the tunnel has survived for so long.

There are usually conditions attached to a Works Order grant. Each one of which has to be agreed with the relevant local authority. These will be listed in the Order, but I don't have a copy to hand. However it is quite likely that some of the basics can be started straight away, although...

That statement was corrected by Snowball in the Post that followed.

That is really alarming. It just should not have happened and suggests a considerable amount of material has collapsed into the cutting face. The excavated ground is supposed to support itself long enough to get the lining rings placed.

Most unlikely. They are usually not completely rebuilt. The deck or arch is usually removed and the abutments taken down to the level of the bottom of the arch. The abutments are then usually built up with large pre-cast concrete blocks. The new decking is then placed on the new blocks...

This was reported in the thread Manchester to Liverpool Electrification, but it should be on this thread. It is reported in the newspapers that Carillion has been chosen for electrification projects including NW. For example Construction Enquirer or Yorkshire Post

The FT is a subscription service. Better to look at Yorkshire Post or Construction Enquirer

They aren't, in fact they are quite common in the UK. The EU rules dictate that they have to be considered as endagered, so we have to abide by the rules.

Some of the driver training runs have been cancelled according to RealTime Trains, with the message:- Does anyone know what this really means? As far as I am aware the line is not signalled with ETCS and none of the trains are equipped with ETCS either.

Although a good idea from the travelling public's point of view, but bearing in mind the amount of work still to be done, this does seem somewhat premature.