@@jaacoblosov7327 They look identical yet motors are not. 4 pole in most subway cars of this kind, yet 6 pole in Warsaw metro, model 81-572/573. That is what gives it this distinctive dissonant motor sound.
81-572/573 indeed have different motors from 81-717.3, 6 coil motors instead of 4 coil motors like here th-cam.com/video/DSUlW8Ysu7Q/w-d-xo.html it is not an additional motors but having 2 additional coils on stator causes that dissonant sound. 6 as opposed to 4 stator coils reduces top speed by 1.5x times but increases acceleration and ability to climb slopes 1.5 times given other things being equal. Compare this (in most Eastern Bloc metro trains), 4 coil motor, refer to the right picture www.electronics-tutorials.ws/wp-content/uploads/2013/08/io31.gif In Warsaw 81-572/573 trains motors are approximately like this previews.123rf.com/images/efes/efes1303/efes130300041/18702692-dc-motor-6-poles.jpg
![Alstom Metropolis 98B 🚇31 (2031+1061+1062+1063+1064+2032) [🚇 ➡ M1 - Metro Warszawskie - Przejazd]](http://i.ytimg.com/vi/WLUPhD-g9I0/mqdefault.jpg)
![Alstom Metropolis 98B 🚇31 (2031+1061+1062+1063+1064+2032) [🚇 ➡ M1 - Metro Warszawskie - Przejazd]](/img/tr.png)
Warsaw metro in poland is very similar at st.petesburg metro, they are brothers
do you mean subway cars? They look similar because they are identical, Russian. lol
Even Sofia, Budapest, Minsk, Kyiv, Moscow, Tbilisi, Yerevan, Baku Gand Tashkent has these cars
@@jaacoblosov7327 They look identical yet motors are not. 4 pole in most subway cars of this kind, yet 6 pole in Warsaw metro, model 81-572/573. That is what gives it this distinctive dissonant motor sound.
Nice video
Thj
快速和慢速訓練
Is that me or the 81-717.3/714.3 and the 81-572/573 have an additional engine sound?
81-572/573 indeed have different motors from 81-717.3, 6 coil motors instead of 4 coil motors like here th-cam.com/video/DSUlW8Ysu7Q/w-d-xo.html it is not an additional motors but having 2 additional coils on stator causes that dissonant sound. 6 as opposed to 4 stator coils reduces top speed by 1.5x times but increases acceleration and ability to climb slopes 1.5 times given other things being equal. Compare this (in most Eastern Bloc metro trains), 4 coil motor, refer to the right picture www.electronics-tutorials.ws/wp-content/uploads/2013/08/io31.gif In Warsaw 81-572/573 trains motors are approximately like this previews.123rf.com/images/efes/efes1303/efes130300041/18702692-dc-motor-6-poles.jpg
Warsaw metro is better than Rome metro
I have not see the train like m2 line.
M2 uses Siemens Inspiro trains only, M1 has also Alstom Metropolis 98B and old Soviet/Russian Metrovagonmash 81(that is on the video).
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Rh
Пришелец
彩色小丑
火車
9oooooo
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Kkkujko
KHALED TV and