10 Differences Between the 1995 and 1996 Stock 

Oh, that's interesting!

LMAO XD

I have noticed the height on the 95s whenever you see them going in or coming out of the tunnel, the roof of the train seems as though its basically scraping along the top of the tunnel, its crazy

Ooh, now we're talking 😂

@@NickBadley if you did do that, you've got to talk about how the 508s used to have 4 cars, but one of them was taken out to lengthen the 455s, which now have an odd car (from the 508s) that's different to all the others! I'm not sure how that would fit within the video, but it's the sort of information we'd love to see!

Another challenge would be differences between class 45 and 46 Peaks (and there is at least one visual difference)

they were different i think but one of the stocks got refurbished to look more like the other one so they look the same

@@NickBadley fact: due to the DC compressor pressure being different on the 507 than the 508 the 507 lights flicker in tunnels where as 508 don’t. (I haven’t seen a 507 flicker since 2020 though on Moorfields but on the Wirral line I have)

A shame it was missed out of #1, as this is a key technical difference.

GTO is the older technology too, having been around since the early 90s. IGBTs have been used for many years since!

I feel that the 1996 and 1995 stock sound similar when coasting but sound very different when accelerating or braking.

@@PeteS_1994 Makes sense. Similar/same motors but different electronics.

@@bfapple Why does the 1996 stock have older technology (GTO) than the 1995 stock (OniX)? production delays?

Not quite. It’s because the Jubilee spec was frozen earlier in the decade.

Glad you liked it!

Same here, honestly! I love the noise they make when they leave

I love the 1995 stock ss it has the oh the prettiest screeching noise and the height suspension and the fact it is more modern than 1996 stock despite the confusing names

Not really the motor sound. They use similar motors, but different variable frequency drives (module controlling speed of motor). 1996 stock uses the more primitive GTO-VVVF system (which has a lower pulse frequency, hence more audible), and the 1995 stock uses a more modern IGBT-VVVF system (higher, less audible pulse frequency). They both use induction motors.

Glad you enjoy!

Thank you very much! :)

Yeah, I’m glad that the 96 stock chime pitches haven’t been changed, not a fan of the lower pitch ones ok the 95. Sounds torrid

Who have known that about the carriages.

@@gapthemind--mindthegap8524 Literally anyone who lives in London

@@OffTheRailsUK nah most people aren't that perceptive. Alot of us were kids too when this happened, I'm 24 snd thought they always had 7 carriages

I believe so, yeah

I’m not sure if the motors are actually different. It’s the three-phase inverters that result in the sound as a by-product.

It's because TFL were using relatively new 1983 stock on the jubilee line but their single doors were proving impractical due to high capacity. This meant TFL needed a large number of trains quickly. The compromises made with the 1996 stock (there are several btw including spring suspension instead of air suspension) were to reduce costs and decrease manufacturing time. GTO transitiors were well established so were easy to get hold of, hence why they used the "older" (but cooler imo) technology. IGBT transistors were brand new, revoloutionary technology and so were expensive and hard to get hold of. The GTO transistors have a very different way of handling changes is speeds as the have completely different limitations to them. The older GTO Thyristors cannot handle the same high frequencies as the newer IGBT. This is important as the frequency needs to be increased in order to speed up the motors. As a result, they have to change the PWM pulsing pattern in order to reduce the switching frequency. It's this pattern changing that causes the distinctive sound when accelerating / decelerating. If you want to learn more, I recommend this video (it's a very nerdy topic): ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-VOm8ePMg1dE.html I copied my reply from another comment lol bcs i cba to write it again haha

It is because of visually impaired people may have trouble with black, whereas they have no trouble with yellow.

The Central Line stock had these open buttons too, and worked a similar way. But of course, nowadays they are completely bypassed, and rendered useless, which explains why the 1995 stock had the buttons replaced with a single indicator after refurbishment.

Ooh! I actually never noticed that! Good catch!

That’s interesting, do you have more info on that? (Being technologically 1991)

The 1996 uses GTO traction similar to the Networkers and the 323, which is why it has its certain sound, and the 1995 stock uses IGBT traction with Alstom's ONYX Drive, which is the shrill, continuous whine.

@@yy17782A lot of the contractual design detail was frozen in 1991.

@@thebcplayer Singapore's C751A rolling stock meanwhile use ONIX IGBT but sound like a higher pitched version of GTO instead, though the C830 that uses the same IGBT tech sounds more the '95 stock. Might be due to differences in the voltages used (1.5kV & 750V DC respectively)

@@lzh4950 Line voltage and motor voltage don't always exactly "line" up, pardon the pun. Multivoltage trains are a great example of this, that may use 750V third-rail power usually, but can transform the 1500V OLE voltage down to 750V for pantograph operation.

I thought the first 96 stock ran before the first 95 stock?

Question: Would that mean that the Northern Line was supposed to have that "Jubilee Line Sound"?

@@ikec-pw5sb probably

@@ikec-pw5sb no, the northern line doesn't have that sound because it has the newer IGBT technology. The older GTO transistors (the ones the 1996 stock have) have a very different way of handling changes is speeds as the have completely different limitations to them. The older GTO Thyristors cannot handle the same high frequencies as the newer IGBT which are needed when speeding up. As a result, they have to change the PWM pulsing pattern in order to reduce the switching frequency. It's this pattern changing that causes the distinctive sound when accelerating / decelerating. If you want to learn more, I recommend this video (it's a very nerdy topic): ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-VOm8ePMg1dE.html

Yeah I even know some 455s, 75mph use EE507 motors (ancient motors) using a lack of power 317. 100mph, use GEC motors G315bz motors etc etc

How about a video on the differences between the Flying Scotsman and the S7 Stock?

Ah yeah that's a good idea. Off the bat, I know of the different grab poles and W&C being 4 car as opposed to Central being 8 car.

​and the central line poles are red while the w&c line pole is turquoise

Here's one: On the 72s the front train lights are closer to the middle while the 73s are nearer to the edge of the front

It sounds like a cr4000 tram as well