Still heading east.
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2024 Tube Stock (Siemens Inspiro London)
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OneTrackMinded
Member
Very much so, nowhere to be found on intertube.
Of course it did, but the media don't sell content by declaring "Train measured for tunnels, fits in tunnels".
Momodou2003
Member
So the doors use the same sound as was shown in the Rags Martel new Pic line video. A bus door sound opening and a slightly lower pitched beep sound compared to S Stock when closing, probably less clinical sounding a bit. Also open faster than they close like on S stocks. I wonder why that is.
That’s not the style of inverter sound Siemens has used us to.
Which sound would you expect. I kind of expect the sound to evolve with the technology like I think it has with bombardier/alstom trains in the uk, as i haven’t looked enough at trains in other countries to be sure.
Honestly such a shame that these will be restricted under legacy signalling. Really hope they don't have to wait as long as the S Stocks did as you really feel the full worth of them now under CBTC.
But a change in trains is still at least half the job done.
Re the motor sounds - I am guessing people (at least enthusiasts), were hoping for a loud but modern sound as is the case with the S Stock/2009ts and most modern stuff on the National Rail network. It's kind of strange that they are very quiet as we are not used to it since the 1983 stock! But this is progress on technology
But a change in trains is still at least half the job done.
Re the motor sounds - I am guessing people (at least enthusiasts), were hoping for a loud but modern sound as is the case with the S Stock/2009ts and most modern stuff on the National Rail network. It's kind of strange that they are very quiet as we are not used to it since the 1983 stock! But this is progress on technology
OneTrackMinded
Member
The motors are quiet because they are Permanent Magnet Synchronous Motors (PMSM), rather than the traditional asynchronous AC motor. This is Siemens’s first use of the type, and one of the first uses in the entire of Europe, definitely metro.
The videos don’t really tell us how the motors sound.
The little whistling sound comes from the inverters.
Dstock7080
Established Member
Signals would still need immunisation, co-actors provided where necessary, platform and tunnel gauging would also still be required.
Honestly such a shame that these will be restricted under legacy signalling. Really hope they don't have to wait as long as the S Stocks did as you really feel the full worth of them now under CBTC.
But a change in trains is still at least half the job done.
Re the motor sounds - I am guessing people (at least enthusiasts), were hoping for a loud but modern sound as is the case with the S Stock/2009ts and most modern stuff on the National Rail network. It's kind of strange that they are very quiet as we are not used to it since the 1983 stock! But this is progress on technology
2009ts/s stock are much louder than a lot of new aventras. They are considered new by tube standards but don’t seem new to me because of other new trains that came after. Just modern.
The air release sounds clean.
The inverters sound a lot like the 1995 ts, probably quieter though.
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OneTrackMinded
Member
Yes, we cannot hear the motors because they are quiet!
What difference does a pmsm make compared to the traditional ac motor?
OneTrackMinded
Member
In short, they have significantly higher efficiency (meaning less heat, which is important in this scenario), higher power to weight ratio, higher starting torque, shorter starting time, smaller size, more precise control, and lower noise, amongst other benefits.
For a technical deep dive, have a read of this:
Attachments
boiledbeans2
Member
PMSMs are used in the AGVs. It was also used for the TGV 2007 world speed record of 574 km/h.
In a non-railway use, they are found in most electric vehicles today.
ExRes
Established Member
Sorry if I've got my stock type wrong, 'RailAdventure GmbH - Aktuelle Sichtungen und Bilder' facebook have 38032/48032 passing through Passau today in a delivery convoy
OneTrackMinded
Member
I’m referring to a railway application, not cars. Also I said “one of the first uses of PMSM in Europe”, which indicates that it’s not the first, but one of few, along with examples like the AGV. Prototypes such as the world record attempt version don’t count as an actual train class with the type installed.
This is definitely the first PMSM motor to be used outside of Asia in a metro application, excluding prototypes again.
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Dstock7080
Established Member
That is 2024 Tube Stock
Searching I actually think Toshiba first implemented it on a commercial metro train in 2014 in Tokyo.
I think it'll be a gamechanger for both the Piccadilly Line and eventually the Bakerloo Line.
OneTrackMinded
Member
Yes I know - I said “outside of Asia”.
I was correcting the comment on the agv that used pmsm, which is correct, but wasn’t commercial.
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Momodou2003
Member
Footage from TFL showing train arriving at South Kensington it’s gonna be really interesting to see how the trains stop in the tunnel section as the some of the platforms are shorter the train.
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