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Now I would have said exactly the opposite to that - the bridge has almost no strength or rigidity in torsion. It has no lattice members across it to give that rigidity, i.e which would have to change length as the bridge twists. It never needed any, as it was rivetted together in situ (the...

I think I heard Stuart Calvert say there would be 200 lorryloads of spoil from the embankment to remove, and the same to bring back later. I can't find that now; I suspect it was on BBC South Today and has now vanished from iplayer.

There is a very detailed description of RCH's operations in 1935 in the Railway Wonders of the World partwork (all now on line). By that date the apportionment was largely done by fixed ratios, and the number of journeys based on records of tickets sold. Tickets were still collected and sent to...

What I've seen in the background of those videos, mounted on a big digger, is a Movax side-grip vibratory pile driver (SG series). And TMS list one as part of their equipment for piling contracts, though call it SPH-75 (and they have hired in excavators). I think that's an outdated model name...

There are two visual and tactile marker lines, with different purposes. They were agreed between the sponsors (Reading Borough Council) and DfT as an exemption from Standard 4.2.1.12(6) of the Persons with Reduced Mobility (PRM) NTSN. This was provided in a letter dated 8/12/21, which...

Idiomatic usage does change, and we all know about how railways stick to their way of doing things. So what was common before 1830 may have been reinforced by everyone using the railways, but we've had two generations using them less and less and inventing new idioms based on their experience...

I think you'll find that the notion of "up" being to the top of a map, which is always north, is quite recent, at least in use of language terms. Looking at newspapers for 1800-09 I can find lots of examples of people going "up to London" and "down to the country". Of course they also went down...

The following quotation comes from a longer letter to the Yorkshire Evening Post, printed on 14/7/1927, from Ben Riley, a ticket inspector. He was trying to justify his job as being important and necessary, while in practice (as you would expect) a lot of passengers resented having their...

If you look at Network Rail's page about the 2023 refurbishment programme, its introduction includes "replacing the 100-year-old station roof". However, when you get down to the section headed "Repairing London Waterloo’s 100-year-old roof", the text has: So it's the roof of the concourse...

I suggest you look at newspapers first, starting with getting access to the British Library Newspaper Archive. That may not have the titles you want, and coverage tapers off after 1990, but it's a good start. For example, the Aberdeen Press and Journal of 29 December 1990 reports that P&O and...

We do know the weight of the 1906-7 bridge: 180 tons for the girders, 325 tons for all the steel. As well as the live loads, there's ballast and track to add to that, and now there's all that extra ballast at the south end as well. Since the new spans were twice the length (90') of the old...

There are several very similar geograph pictures, and I got the wrong one (from the south). This is yet another one from the south, but better framed: (© Copyright Steve Daniels and licensed for reuse under this Creative Commons Licence.) I've changed the one on my post to match the words.

I've been hunting for more pictures of this abutment, and here's a couple of useful ones. This geograph picture was taken in 2009, from the other end from the one in post #243. (© Copyright Steve Daniels and licensed for reuse under this Creative Commons Licence.) Judged by eye, the south...

That date of 1929 on thames.me.uk has got onto the wrong page - it relates to Appleford viaduct. The bit about "a single bow structure" clearly belongs there. If you rely on the two pages of the Great Western Railway Magazine, quoted by Culham Ticket Office (Nuneham and Appleford), and on some...

It's an aqueduct, carrying a little stream (mostly in culvert) called the Potters Bar Brook. This map on NLS is from 1936, since which even more of it has been culverted and some bits moved about to avoid new houses. On Google Earth you can see one bit of new route just to the east of the...

I think the statement that the bridge was replaced in 1929 by a single span must the wrong. If you look at the pictures in that article, they clearly show the bridge that's there now - with two bowstring girder spans. They also show the viaduct bit, the three spans over land on the north bank...

The TBM power supply at Ruislip is provided by a cable under the streets from a UKPN (so DNO not national grid) substation at Rayners Lane. Afterwards it, via the new substation at the Ruislip end, will not be reused for traction power. Presumably it will be mainly for tunnel ventilation and...

That SGN plan I linked to before (post #16) explains the situation of Stornoway. That SIU uses LPG, not LNG, and can store 542 tonnes of it - enough for more than three months. I presume that is why LPG is preferred; it is at liquid ambient temperature, where that much LNG would need big...

At the end of that press release it says: The arrival of the first Linsinger one was reported in this thread. If that new machine (there may be a second one too) is now in use, perhaps the parked one is going to be returned.

Yes ... or almost. When this LNG by rail started in 2018, those two were served by road from Coatbridge. Was there a switch from using Coatbridge to Mossend? Or do they use both? Maybe - obviously SGN are just looking for convenient multimodal trains to hitch a ride with. DRS should at least be...