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Post by t697 on Apr 27, 2023 18:45:22 GMT
It's correct that on S stock routes there is no station or individual platform where the 3rd doorway in the front car is not programmed to open. The only platform where the 3rd doorway in a car doesn't open is Baker Street platform 5 (Eastbound and Outer Rail) where all three doorways don't open on the rear car.
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Post by t697 on Apr 25, 2023 17:16:28 GMT
Is the link 'South'? If so that might prompt some targetted guesses.
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Post by t697 on Apr 22, 2023 8:16:58 GMT
Wikipedia says the conversion of the 38TS trailers to work with 1960TS included the fitting of two compressors. I'm sure they were reciprocating compressors not KLL4s.
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Post by t697 on Apr 22, 2023 8:00:14 GMT
B - Possibly South Quay?
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Post by t697 on Apr 15, 2023 21:40:49 GMT
Does this train have the same sound as it did when in service, or have changes necessary to comply with current standards meant that different 'unseen' equipment has had to be fitted? The majority of people around to enjoy the 38TS this year who also experienced them in 'normal' service will only have done so when they already had the KLL4 compressors replaced by reciprocating ones I think. So still a very realistic step back in time, just not to their set up in 1953...
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Post by t697 on Apr 11, 2023 5:57:12 GMT
Link - roads Odd one out - Tooting Broadway being on Northern line while the others are on the Piccadilly?
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Post by t697 on Apr 10, 2023 19:24:41 GMT
The smaller text names the diverging route for each direction. It's a safety initiative to address a recommendation from an incident where apparently workers weren't clear about that or the limits of their work space. Appearing across all lines now, including in tunnel divergences.
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Post by t697 on Apr 7, 2023 11:35:15 GMT
I think 'A' is Turnpike Lane.
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Post by t697 on Apr 6, 2023 20:04:10 GMT
Sports ground and housing just north of Preston Road station from train on NB Local?
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Post by t697 on Mar 30, 2023 5:34:07 GMT
Future stocks specified up to 15mph, which allowed confident operation up to 12mph, an effective 50% increase. Happy to be corrected after so long! I seem to recall this was only on D78 stock, maybe 83TS as well. Soon after, there was a further review about what speed would best support a driver in 'being able to stop short of any obstruction' in adverse conditions and as a result the setting was reverted to 10mph or 17km/h. In even later stocks the 10mph is rounded down to 16km/h. S stock and I think 09TS have a feature automatically regulating the speed to just below the 10mph safety brake speed under overall driver control and vigilance. So they can maintain about 8.5 - 9mph in RM.
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Post by t697 on Mar 26, 2023 6:07:42 GMT
Upney.
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Post by t697 on Mar 17, 2023 22:12:49 GMT
Unfortunately, not yet. SMA 7 will continue with 56mph (90kph) This tag reading issue does seem odd when one considers how many years ago this was being tested at Old Dalby with S stock and the first but apparently fully representative CBTC equipment at up to full speed, yet it has 'only come to light recently', shortly before SMA6 was commissioned.
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Post by t697 on Mar 17, 2023 21:59:50 GMT
Pretty well all modern suburban and metro trains with powerful HVAC do this for the reasons stated. There seems to be an undercurrent of opinion with some passengers that because older LUL trains don't, the newer ones shouldn't!
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Post by t697 on Mar 16, 2023 20:28:01 GMT
A sudden cut off would probably be current rail gaps as mentioned. As built, when wheelspin was detected, that also resulted in the linebreakers opening and the equipment notching up from off again, at the lower rate of acceleration. Back in the early 80s this was modified so that wheelspin detection results in the equipment notching back which reduces the current and the wheelspin stops then notching up at the lower rate of acceleration can resume. This made the spin recovery smoother.
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Post by t697 on Mar 16, 2023 20:20:45 GMT
Shift this to historical or rolling stock if seen more fit. While looking for some 1973TS data I found a formal issue set of notching curves for 1973TS for 750 Volt operation, dated 1976. I was aware of plans to re-signal the Piccadilly line to use the full 1973TS performance capability but hadn't been aware of any plan to raise the traction voltage as part of that.
Was that actually being considered at the time?
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Post by t697 on Mar 16, 2023 20:14:00 GMT
Not as far as LUL trains' CIS are concerned. We have to announce LO and National Rail services as separate items where both exist and can be interchanged to from an LUL train. Or at least that was the rule the last time I was involved in an update...
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Post by t697 on Mar 14, 2023 6:29:41 GMT
Sorry,something went wrong and I can't edit my mess above. Anyway, S stock uses the same brake block compound as other LUL fleets. There is a specific thermosetting resin binding the friction material fillers. This produces a distinctive smell when used hard,as would be the case for a high speed emergency brake as seems to have been the case in the Moor Park example quoted in the OP.
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Post by t697 on Mar 10, 2023 22:43:58 GMT
My recollection is that it had already been decided to close the Ongar service. Management didn't really want the traction voltage testing done up there in case it gave the wrong public impression - that the service might stay open. We had to justify the test trips as the most efficient way of gathering data and testing the solution. As mentioned I don't recall why the 4 car trip was made. Perhaps it was to show there wasn't really enough power even for a 4 car!
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Post by t697 on Mar 10, 2023 18:21:25 GMT
And for those who can't understand how a Surface Stock train could get to the NB platform at West Hampstead to need this sign, there used to be a crossover from NB Met to NB Jubilee just north of Finchley Road. Removed quite a while ago, perhaps around the time the Jubilee was resignalled for TBTC or an enabling work for that.
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Post by t697 on Mar 10, 2023 18:17:45 GMT
B - Park Royal from EB platform? D - Putney Bridge from EB platform?
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Post by t697 on Mar 9, 2023 8:52:50 GMT
Yes. Doesn't stand a logical safety assessment overall though. Especially given that the track remains live, you have to either lean out of M door holding on with one hand and pulling the rope with the other, or actually descend the slippy coupler to the track to reach the rope on the earliest types. And maintainers were expected to do this even over depot pits. And as proved oh so often, time interval is a terrible protection from collision with the train in front.
Anyway, it will be interesting if anyone else has memories of 92TS to Ongar.
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Post by t697 on Mar 9, 2023 8:05:41 GMT
A reminder that the Central line was still not ATC at that time, you can see the external tripcock reset rope and a yellow switch below the driver's side front that may have been the tripcock cut-out switch, later Tripcock/ATC changeover? Design relics from a time when I suppose it was thought that having the rope dangerous to get at would instil more care not to SPAD. A bit of a nonsense really and a hazard for daily prep. Brought inside on later builds and on a D78 mod. The isolation switch outside was visible indication to 'operating officials' that the tripcock was cut-out, but it took a while for the logic to work through that since from 73TS onwards cutting out the trip enforced Slow Manual, that wasn't going to be something done unthinkingly. So again the switch could be brought in cab.
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Post by t697 on Mar 9, 2023 7:34:13 GMT
Nice pictures. The destination displays are the original backlit LCD ones. As with nearly all such displays of that time they failed quite quickly and were replaced after a few years by the LED ones currently fitted.
From the list in the other thread linked earlier this appears to have been the trip on 13/7/93. I'm pretty sure that was when investigating low voltage performance, as an extreme case, as we were having trouble with operation at lowish voltage accelerating out of Ealing Broadway at the time. The Ongar trip provided data that ABB used to adjust some traction parameters. Later Ongar trips were to prove those fixes, but I can't recall what the 4-car trip was for. Eeek- nearly 30 years ago!
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Post by t697 on Mar 8, 2023 21:47:35 GMT
So, I think Clapham North.
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Post by t697 on Mar 8, 2023 18:17:43 GMT
I'm looking forward to the picture
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Post by t697 on Mar 8, 2023 7:31:16 GMT
Don't they need more oomph for more getoutofthewayness on a high intensity high frequency CBTC line when pathed between high performance passenger stock ? AIUI thats why the D RAT is 4 motor cars for total 5 cars - for the future all CBTC railway. I would expect any Picc RAT post new stock and resignalling will be same even if resignalling is years away and might be something different it will still want ooomph for the same reasons. Maybe, but the Piccadilly line is all 'all stations' passenger service. A train that doesn't have to have passenger dwell times at stations has to be really slow to cause significant delay to following trains. Last I heard, 73TS RATs were going to stay 3 car. Things can always change!
Maybe one of the unused weak field steps could be reinstated if a bit more speed was really needed. They'll already be quicker than today though, once the rest of 73TS are gone, the traction supply made 750V and they have the relevant mods to stand the voltage, like the D78 RAT and other conversions have had, to operate on the SSR 750V areas. Also with the LUL TBTC and CBTC schemes to date, run through speeds at non-stopping stations (which the RAT would be doing) are about 20mi/h not the 5mi/h at the starter for traditional LUL signalling. So that again mitigates the RAT being slower than 24TS on full new signalling.
All this assumes of course that adhesion management becomes so good that we don't need leaf-fall Temporary Speed Restrictions and special timetables that slow down the passenger service anyway.
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Post by t697 on Mar 8, 2023 7:12:22 GMT
I was thinking Neasden southbound headwall.
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Post by t697 on Mar 7, 2023 19:38:23 GMT
Hault (adjective) means(obsolete) lofty; haughty; conceited. Derivation from French; haut. But I guess it's just meaning halt here. :-)
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Post by t697 on Mar 7, 2023 19:32:12 GMT
Mysterious eh? Was there still a plan for trains to stop for very secret passengers? Or has the sign come from somewhere else to enliven the public tours of Down Street?
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Post by t697 on Mar 7, 2023 19:27:03 GMT
73TS RAT - I think future plan is to keep them as a pair of 3 car trains. They seem to work fine like that for their Piccadilly line task. I'm not convinced the D78 RATs really needed to be 5 cars with 4 being motors, but it does give a reserve of power. At the time, the under powered and under braked AIT conversion was fresh in the corporate mind.
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