I’ve been on the Thameslink Class 700 and they are very nice trains. Plus the onboard announcement should say “This train will change voltage at the next station”.
A very subjective view. There are those of us who nearly lost our jobs after the Class 700 build went to Siemens, not Bombardier. They may be decent enough trains in terms of spec, but I detest them with a passion.
@@brunaskarting116i take it you're refering to Bombardier's bid when they ran Derby works? the government's total refusal to create a proper rolling stock stratergy is what has left Derby hanging on a thread so many times. If you're problem is subjective irrationality, it is deeply subjective to hold animosity towards SIemens or their trains because they won a contract over Bombardier one time when it's DfT and Treasury who have been leaving Derby out to dry multiple times a decade by means of their own incompetence and mal intent. Also, Derby got the work for Crossrail which many see as a dog thrown in their direction for them missing out on Thameslink. Idk how true that is, but either way it was an objetively bad choice as Derby were unable (for whatever reason) to build a train at the standard British platform height, and now the central section of Crossrail has been built with platforms higher than standard which bakes in inaccessible boarding on the eastern/western sections forever. (what you gonna do, rebuild underground stations with platform edge doors and replace your whole fleet in one go - fat chance of that. You could raise the height on the GEML and GWML sections but now those lines are potentially inaccessible to GA/C2C/GWR/freight services thereby severley reducing the reliability of those routes) Perhaps you know why Derby could not or did not build a train to a correct platform height. My guess is that they did not have sufficient time to both develop a new train family and get the trains ready for 2019 or whenever people were hoping XR would open. In that case, it's once again the government failiure of refusing to create a rolling stock plan.
As far as I know this sound is unique to the UK. Other siemens desiro units running in Europe have a completely diferent sound, even though they’re from the same family. As for Japan very few trains use Siemens inverters (mostly Keikyu trains), but they also sound completely different.
Because inverters don't have the same job to do.... I do not know the motors of this model, but being from the model desiro, they are surely asynchronous three-phase. When it is under 25kV AC the inverters only have to lower the voltage and change the frequency. When it is under 750DC the inverters must transform the direct current into alternating current (with the frequency) and lower the voltage. Not the same work, not the same noise.
@@Lodai974 whilst I agree with everything you’re saying, older dual voltage desiros didn’t have a smooth sine wave sound like the 700’s do, they make a different pitched “ufo noise” depending on if it was running on AC or DC… maybe Siemens found this smooth sine wave to be more efficient?
@@benjibatch In general, the arrival of a new train model leads to a new sound, because in the meantime the manufacturer changes the modulation (the programming of "how the inverters should work"). For example to take Alstom: the OniX is present in many networks and yet very few have the same sound. Because there are different models of OniX and each has a different modulation.
@@DaveSimulation There are only one set of traction motors. And they are 3-phase AC motors. The normal way of powering a modern train today is taking 25/15kV AC, transforming it down to 1500V AC, sending it thru a rectifier making 1500V DC, and then using an inverter to make variable voltage, amperage and frequency to control the 3-phase traction motors. If you run under 3000/1500V DC, you skip the first transformer stage, and send that voltage to the inverter directly. So when running on thirds rail 750V DC, you have an additional step of converting the voltage up to 1500V DC for the inverter systems. That is what is making the "ufo sound" when under third rail power.
![[Sound] Baureihe 474 S-Bahn Hamburg | ABB GTO | [S2] Aumühle - Altona (2.2024)](http://i.ytimg.com/vi/LMhEOngfsnU/mqdefault.jpg)
![[Sound] ICE 3neo BR408 | Siemens Velaro MS | Mannheim Hbf - Köln Hbf (08.03.2024)](/img/1.gif)
The best ones were the Class 319’s. Those trains had a very strong growling sound that was the characteristic of the Thameslink.
I love that siren like dc sound that these and the 444’s and 450’s make
Don’t forget the 350s and 360s running on AC too.
And the 707’s and 717’s
And the 380’s
The 350s, 360s and 380s have a higher pitched noise that I don't like as much but they still sound good
I’ve been on the Thameslink Class 700 and they are very nice trains. Plus the onboard announcement should say “This train will change voltage at the next station”.
A very subjective view. There are those of us who nearly lost our jobs after the Class 700 build went to Siemens, not Bombardier. They may be decent enough trains in terms of spec, but I detest them with a passion.
And all that^ for ironing board seats. Still, I've never been remotely close to one of these so the sounds are what get me interested.
I think that Siemens wanted to build new trains that Govia Thameslink Railway wanted. And all 115 Class 700 trains have been built for Thameslink.
@@brunaskarting116i take it you're refering to Bombardier's bid when they ran Derby works?
the government's total refusal to create a proper rolling stock stratergy is what has left Derby hanging on a thread so many times. If you're problem is subjective irrationality, it is deeply subjective to hold animosity towards SIemens or their trains because they won a contract over Bombardier one time when it's DfT and Treasury who have been leaving Derby out to dry multiple times a decade by means of their own incompetence and mal intent.
Also, Derby got the work for Crossrail which many see as a dog thrown in their direction for them missing out on Thameslink. Idk how true that is, but either way it was an objetively bad choice as Derby were unable (for whatever reason) to build a train at the standard British platform height, and now the central section of Crossrail has been built with platforms higher than standard which bakes in inaccessible boarding on the eastern/western sections forever.
(what you gonna do, rebuild underground stations with platform edge doors and replace your whole fleet in one go - fat chance of that. You could raise the height on the GEML and GWML sections but now those lines are potentially inaccessible to GA/C2C/GWR/freight services thereby severley reducing the reliability of those routes)
Perhaps you know why Derby could not or did not build a train to a correct platform height. My guess is that they did not have sufficient time to both develop a new train family and get the trains ready for 2019 or whenever people were hoping XR would open. In that case, it's once again the government failiure of refusing to create a rolling stock plan.
I wrote the title and description in Japanese and English (UK). Give me your feedback if ENG description is not shown.
English is not shown
@@dennispnut I've just set the default in English. Try to update this video.
@@SepianSound works fine now 👍👍
9/10
Довжина поїзду 160/240 метрів.
Може їздити під третьим рейком або під контактною мережою.
Швидкість до 140 км/г.
Are there any Japanese trains that do this?
As far as I know this sound is unique to the UK. Other siemens desiro units running in Europe have a completely diferent sound, even though they’re from the same family. As for Japan very few trains use Siemens inverters (mostly Keikyu trains), but they also sound completely different.
@@peteschneider2241 When the Siemens velaro D units change between DC and AC there are more subtle motor changes.
I wonder why it changes sounds when switching to third rail and vice versa?
Because they have different tractions/motors
Because inverters don't have the same job to do....
I do not know the motors of this model, but being from the model desiro, they are surely asynchronous three-phase.
When it is under 25kV AC the inverters only have to lower the voltage and change the frequency.
When it is under 750DC the inverters must transform the direct current into alternating current (with the frequency) and lower the voltage.
Not the same work, not the same noise.
@@Lodai974 whilst I agree with everything you’re saying, older dual voltage desiros didn’t have a smooth sine wave sound like the 700’s do, they make a different pitched “ufo noise” depending on if it was running on AC or DC… maybe Siemens found this smooth sine wave to be more efficient?
@@benjibatch In general, the arrival of a new train model leads to a new sound, because in the meantime the manufacturer changes the modulation (the programming of "how the inverters should work").
For example to take Alstom: the OniX is present in many networks and yet very few have the same sound. Because there are different models of OniX and each has a different modulation.
@@DaveSimulation There are only one set of traction motors. And they are 3-phase AC motors. The normal way of powering a modern train today is taking 25/15kV AC, transforming it down to 1500V AC, sending it thru a rectifier making 1500V DC, and then using an inverter to make variable voltage, amperage and frequency to control the 3-phase traction motors. If you run under 3000/1500V DC, you skip the first transformer stage, and send that voltage to the inverter directly. So when running on thirds rail 750V DC, you have an additional step of converting the voltage up to 1500V DC for the inverter systems. That is what is making the "ufo sound" when under third rail power.
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