Gareth Dennis Profile picture
Jul 7, 2021 15 tweets 9 min read Read on X
I'm on my holidays but have nipped off on some brief #PointlessPerambulations to look at the rather unique and squeezed-in former railways in Barnstaple...
Here's what it looked like! It was properly squished in next to the old Barnstaple Bridge, popping out over the muddy Taw at around 90° and joining the other bank almost parallel to the river. #PointlessPerambulations
Ah, I see @CleveBridgeUK have been at it again! #PointlessPerambulations
There are lots of signs of precisely where the railway bridge sat above the Taw, as I point out here with my waggly finger: #PointlessPerambulations
The new development on the south banks of the river has given a better vantage point to see all that remains of the railway structure... Just this stone arch, with engineers' blue brick and a few sleepers still on top. #PointlessPerambulations
Obviously the railway link between the extant Barnstaple Junction station and the bridge has been replaced - only as recently as the mid-2000s - by a pointless urban dual carriageway. #PointlessPerambulations
Shout-out to the ever-excellent @natlibscotmaps team 😘

1️⃣ The end of the old bridge.

2️⃣ Where I'm stood now, with a stupid dual carriageway on top of the old railway alignment.

3️⃣ The current Barnstaple station.
In the map above you can see a segment of the former alignment remains largely unscathed, and here is me stood on it and rabbiting on about somesuch: #PointlessPerambulations
Here's the view trains might have had making their way round the curve into Barnstaple Junction... Minus a few trees. #PointlessPerambulations
Obviously the last bit is now a car park, but at least car parks can be dug up 👑 #PointlessPerambulations
All of this means that Barnstaple, a town with a wider built up area population of over 46k people, has little more than a rural halt for a station. And don't get me started on the replacement of the main line with the A361 link road. #PointlessPerambulations
Oh, point to note... Up top I was talking about the original Barnstaple Quay station. Once the L&B (@woody_bay) opened, they part funded a new station which was located further towards the River Rolle.

Unlike the original, the "new" Town station (and box) still mostly remains!
Anyway, that's that for now, but I might be topping this up later in the week! #PointlessPerambulations
Oh, and watch this entirely unrelated #RailNatter tonight!

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More from @GarethDennis

Jan 25
Here I'm in agreement - welding rails of two different ages together is completely routine and safe, otherwise you'd have to replace all rails all at once every time.

Crucially, though - it's the new rail that failed adjacent to the weld!
Deleted previous extra bit as I've spotted something that I need to verify.

The new rail has been confirmed as R350HT as seen in the image.

However, the old rail appears to be R260. If this is the case, then a specialist weld is required and that doesn't appear to be the case. Image
Image
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It's very difficult to validate this from the available images, but it would certainly be good to know what grade the older rails to the south of the weld are. Anyone with better photos or access to the material records?
Read 19 tweets
Jan 21
A bit of discussion about this detached bogie being a cause rather than an outcome of the Adamuz crash. It's essentially impossible for a bogie to be released from a moving train without that train already having been derailed. A huge piece of debris, seen by a photographer for The New York Times, appeared to have flown roughly 900 feet from the tracks, landing next to a stream running through a steep-sided gully below the railway.
One of the crashed trains with what appears to be a section of the undercarriage missing.
It's being reported that this was found around 275m from the railway - the potentially 400km/h closing speed of the two trains when they collided will have easily created enough energy to launch the Iryo bogie that distance. another shot of the bogie half covered in a ditch
Despite their mass, bogies are often thrown loose during high energy derailments. The location of this bogie and the section of the train it departed from will help investigators establish the precise trajectories of the derailed vehicles and the energies involved.
Read 21 tweets
Jan 19
I think we're now able to build a pretty clear picture of the most likely mechanism of the train crash at Adamuz in Spain. Image
Image
Image
Image
1️⃣
The northbound Madrid train (a red Frecciarossa 1000 operated by Iryo) passes over a rail weld, likely fractured within its heat-affected zone, that breaks under the impact of the passing train.
2️⃣
The first 5 cars of the 8-car train pass safely over the break, but repeated impacts turn a break into a catastrophic rail failure, and the 3 rear cars of the northbound train are derailed as the rail shatters. Image
Read 9 tweets
Dec 29, 2025
From what I understand, the Interoceánico train that tragically derailed killing 13 people yesterday WAS NOT the High Speed Train of the type I refer to in the video below. An awful lot of people in my mentions jumping to conclusions without knowing the facts.
The challenge for Mexico is that they have no independent investigating body like the NTSB or RAIB. The pressure now needs to be applied to ensure that the investigation is thorough and transparent - or even better that the chance is taken to create an new body.
Further clarity: there is nothing "high speed" about the Tren Interoceánico system. The HST, or "High Speed Train" is specifically the original name of the formation of locomotives and passenger cars that was introduced in GB in the 1970s, capable of running up to 125mph.
Read 8 tweets
Aug 30, 2024
Let's post some receipts, for the benefit of anyone attempting to defend @LordPeterHendy, @SYSTRA_UKIRL and @NetworkRail's actions in some way. Because I have a folder of this stuff. Image
Off the bat, I am going to make an apology and say that I won't do alt text for this thread as it is too onerous - however if you require alt text for accessibility reasons, please just DM me and I can send you the whole lot directly.
So, a few highlights. First up, back in June when I was sorting out my employment with @SYSTRA_UKIRL, I had already made clear statements that I would be continuing my advocacy for rail and my role as a writer and public expert on transport.
Read 30 tweets
Nov 12, 2022
I don't know who needs to hear it, but giving public sector workers a decent above-inflation pay rise is probably one of the quickest ways to turn the UK economy around.
(I do know who needs to hear it, it's Labour shadow cabinet members.)
All the people replying to this saying this will increase inflation: you are wrong and your ignorance is very dangerous. Parrot your Friedman propaganda elsewhere.
theconversation.com/why-wages-shou…
Read 5 tweets

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