Top Tweets for #RailwaysExplained
I've done the scientific digging (in other words, I've spoken to my tame railway rails specialist) to understand not what the standards say, but what the engineering requirements ACTUALLY are. Here's what they said...
Buckle in, this one's a bit of a #RailwaysExplained thread.
If the track is bouncing about (usually because of a drainage or subgrade issue), it wears down the ballast which creates a fine powder that's lighter than the ballast around it... Add water and this becomes a sloppy wet bed! #RailwaysExplained
Question: Does anyone know why the sleepers seem to affect the colour of the ballast? π€
A nice photograph for explaining centre and end throw... #RailwaysExplained
#BRCoaches No.48 : London King's Cross 8th October 1986
British Rail Mark 3 SLEP Sleeping Car with Pantry E10534 built Derby 1981. Original Blue/Grey livery.
#BritishRail #Derby #trainspotting #KingsCross #Sleeper #coaches π€
These are guard rails (not to be confused with check rails) which provide additional restraint to keep a train in line with the track in case it derails... We use them on bridges and particularly risky embankments! #RailwaysExplained
I noticed yesterday a couple of what I think are new features on Barmouth Bridge such as this fixed signal and revised speed sign and this track work at the start of the section of check rail. Not quite sure what the flat rails to the right of the running rails are for.
THOUGH I have it on good authority that these insulators also get referred to as carrots and the pads as biscuits... If you're a pway person, let me know! #RailwaysExplained
There are... lots of insulators, and all for different purposes! These have been superseded by the Fastclip system for modern ballasted track, but they still form a significant proportion of British permanent way. #RailwaysExplained
Here's how it looks as part of the overall fastening system (apologies for the lack of pixels, blame Adobe): #RailwaysExplained
Yes! This is known as a "biscuit", "nylon" or, officially, an "insulator" and two of them sit either side of the rail on sleepers using Pandrol e-clips.
This one's an orange 742a 5.5mm insulator and was ubiquitous from the 1970s-1990s for 1432mm gauge track. #RailwaysExplained
@GarethDennis Hi Gareth. Please can you tell me what this is? I often see them while walking along the Leamside line and remember finding them in the woods near the Durham coast line when I was growing up. I assume it's some kind of track part but would love to know for sure.
Adrian asking an interesting question here... #RailwaysExplained
When renewing or realigning a junction, particularly if it involves sluing the track more than about 100mm, then we'll incrementally replace and relay tracks whilst digging and replacing subgrade/ballast. [1/3]
@GarethDennis hoping you can help resolve a curiosity. At Shepreth branch junction they seem to first replace plain line with more plain line in the same place. Then later they replace it again e.g. with the new switches or slewed line. Am I imagining this? If not, why?
@shuntingwest @lner_adamreid @helisean Not at all! Saves me doing a #RailwaysExplained thread, not that I do many these days...
@pat_mcaleenan An interesting question with a very long answer! I'll maybe try to pull a #RailwaysExplained thread together on this... Probably followed by a @Railnatter, but it deserves me to think about it for more than a minute!
π₯³ HAPPY BIRTHDAY to the SELBY DIVERSION π₯³
The UK's first modern high speed line first carried passenger trains forty years ago today, diverting the East Coast Main Line around the Selby coalfield...
Read all about it in this old #RailwaysExplained! https://t.co/M3uYx0maGY
High Speed 2 won't actually be the UK's second modern high speed railway, just as HS1 wasn't its first... This title should go to another line which opened in 1983 (only two years after France's LGV Sud-Est).
Time for a #RailwaysExplained thread on the SELBY DIVERSION π
I've tweeted about it before, but this type of failure is entirely predictable...
In the last couple of decades, S&C manufacturers have filleted the foot to reduce material use, creating a perfect focal-point for stresses a la Comet fuselage. #RailwaysExplained
Unless I'm very much mistaken, this is a rather old hot axle box detector - used to spot failing wheel bearings which can lead to derailments (like the one in East Palestine in the US recently)! #RailwaysExplained
Curious what this is, can you help @GarethDennis? Spotted on the approach to York Station, something bolted onto a piece of track not sure what. Looking at Google maps there are two either side of the running line. https://t.co/dJNFXTnY62
Did you know that #Istanbul is in the process of building 10 #metro lines at once? πβ‘οΈ Watch the video below, produced in collaboration with #RailwaysExplained, to learn how!
https://t.co/87BJui5VGp
There's a big metal bar or three connecting them to hold the track to gauge #RailwaysExplained
https://t.co/Xpi6XYIH1Y
@GarethDennis Doesn't the conical shape exert a small lateral force? What stops the rails from being slowly pushed apart, especially on curves?
Twin block sleepers are grand where you've got a robust trackbed as they're slightly bendier in the transverse plane. And that platform is a reminder that lots of other countries have a far worse problem with PTI than GB does... #RailwaysExplained
@GarethDennis what your opinion about this ballast and sleepers. /also the platform is like 30 cm of the rail top.
Clips have to be applied manually each time, whereas this is fitted once and can be activated repeatedly #RailwaysExplained
https://t.co/UdDPbqnvVZ
@GarethDennis @GarethDennis sorry to lean on you for this bit what's the difference between this and Track Circuit Operating Clips?
It's the sort of thing you might fit in the morning and activate between scheduled trains - with the permission of the signaller - in order to carry out surveys, maintenance or inspections. #RailwaysExplained
As others have pointed out, this is a remotely operated track circuit operating device (TCOD), which blocks a section of track and puts the signals to red, allowing quick access for work to be done between trains but with signal protection #RailwaysExplained
Can anyone tell me what this is???
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