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Post by joeltancl on Sept 20, 2022 16:14:37 GMT
Pardon me if these have been answered elsewhere already - mods, if they have, please point me to the correct thread and close this one.
I have seen videos and photographs of the Central line's 1962 Stock Rail Adhesion Train (RAT). When they were in frontline passenger service, the '59/'62 Stock had speedometers marked in mph. However, I am under the impression from other threads that the current Central line signalling system works using speeds calculated in km/h.
I have two questions.
1. What is the current situation regarding the RAT? Does the present-day RAT's speedometer have the ability to show speeds in km/h?
2. Are speed restrictions (not signalling-related) on the line also set in km/h?
Thank you.
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Tom
Administrator
Signalfel?
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Post by Tom on Sept 20, 2022 19:53:35 GMT
It's been a while since I've been on one of the 1962 stock RATs, but my memory is that as part of the fitment of Central Line ATP equipment they do have the same speedometers as 1992 stock, with a dual display for Target Speed and Actual Speed, both marked in km/h. What I can't remember (as it's been a few years) is if the old dial speedometer, calibrated in mph, was still fitted or not.
All speed restrictions on the line are in km/h, and these are all imposed by the signalling system, even temporary ones.
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Post by joeltancl on Sept 21, 2022 3:39:40 GMT
Hmm, I wonder how they got the speedometer to work.
Another thing: How does the current signalling system interface with the RAT? If (touch wood) there were to be an incident of passing a signal at danger or unauthorised movement beyond a block marker board, how are the brakes activated? Will it cause an emergency stop, as per a similar rule on tripcock lines?
My guess (although it may be wrong) is that it works in some ways similar to the system used on the former 67TS - the ATP contraption somehow would dump the train line air...
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metman
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5056 05/12/1961-23/04/2012 RIP
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Post by metman on Sept 21, 2022 20:39:46 GMT
I’m no expert but I understand the air line is controlled by the ATP system in a similar way as it was when the tripcock was the main safety device.
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Tom
Administrator
Signalfel?
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Post by Tom on Sept 23, 2022 13:10:27 GMT
That’s my understanding too, there is a trip valve which is energised by the ATP controller, and will exhaust the train line to atmosphere if de-energised.
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Post by joeltancl on Sept 24, 2022 19:46:10 GMT
Thanks for the reply. It seems my guess was not too far off...
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Post by fish7373 on Sept 28, 2022 16:52:00 GMT
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Post by xtmw on Oct 2, 2022 20:30:33 GMT
bump.... Doesn't it just have a 'Actual Speed' And 'Target Speed' just like the 92?
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Tom
Administrator
Signalfel?
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Post by Tom on Oct 2, 2022 20:41:18 GMT
Yes, it does. From memory it's exactly the same display just mounted differently.
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Post by xtmw on Oct 2, 2022 21:44:19 GMT
I believe it's at the top of the cab or to the side... Can't remember.
Mod edit [Antharro]: Quote removed. Please be selective about the part of a post you wish to quote rather than the whole post verbatim, particularly if you are replying to the previous post in the thread.
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Post by spsmiler on Dec 3, 2023 11:50:33 GMT
I thought I might add a short film to this thread - of course its on topic - I hope this is OK
1962 RAT train calls at Roding Valley - I get to peek inside part of the train.
I found it better to film the hoppers from a short distance away, rather than standing right next to the train's windows.
The leaf fall sequence was filmed from a bridge near to Newbury Park station ... it was totally unexpected (but much welcomed)
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Post by brigham on Dec 5, 2023 9:29:51 GMT
Must be the best-presented departmental stock ever seen.
I hope that plans are already in existence to recover a heritage 1960s-era train from this rake when its autumn days are done.
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Post by trainopd78 on Dec 18, 2023 12:24:22 GMT
Hi,
Sorry about the late reply, been a busy, busy season.
The 62TS Sandite trains have had the original speedometers removed. There is a battery loco style ATP system fitted which is located in the saloon. The cab has an ATP speedometer in similar style to the 92 stock which has actual speed on the top row and target speed on the bottom. If the train loses code, or the driver passes a signal/ block marker board with a 0 or no code (red signal in old money), the ATP valve opens and drops the 'Train line' air causing a full emergency Westinghouse brake application. The code does drop from time to time through no fault of the operator, hence the huge flats (especially on the 8 car) by the end of the leaf fall season.
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