TTC Subway | Toronto's Rapid Transit System
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- เผยแพร่เมื่อ 11 ก.ย. 2024
- A compilation of some shots of both Line 1 Yonge-University-Spadina, and Line 2 Bloor-Danforth. Shot at College, Rosedale, Bloor-Yonge, Bay, St. George, and Museum Stations.
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Why does the T-series train make the classic sound that it makes? A lot of people may think the changes of sounds are of the train changing gear, which isn't true. So many train enthusiasts will tell you that it's because it uses motors from Westinghouse/AEG/Adtranz (the company who supplied the motors for this train) and mostly "GTO-VVVF inverters". The GTO is actually the name of the transistor/thyristor technology used, but not all sounds relate to the transistor technology. The sound you hear is caused by the VVVF drive pulsing out an artificial AC wave from a DC supply. And again, it's not the train changing gear, it's caused by a byproduct of how the software has been programmed. When we use pulse-width modulation with AC motors in 3-phase configurations, we require 2 sets of transistors for both positive and negative, and since we have 3 phases we need a total of 6 transistors. GTO thyristors (as our so called transistors) can only pulse at about 400 times a second. This means when we reach a certain speed, we need to cut out some pulses to stop the transistors being overloaded. Since the pulsing is what causes the sound, each time we cut out some pulses the sound goes back down. Then we have it; the distinctive sounds of the T-series Toronto Subway train!
The S-series does a similar method, but it does the pulsing much more slower than the T-series.
Next question: why do modern trains, such as the Bombardier MOVIA Toronto Rocket, not make that sound? Well, this is due to perfectionists who say AC PWM should not at all be affected by the output wave. To do that, it does the same principle as 1980s DC PWM but this time with AC PWM i.e. a set frequency that doesn't change as the voltage changes. They do it so that as the frequency speeds up (which again requires the train and its motor to be sped up), it pulses at the exact moment, so if you choose to pulse at 1kHz for example, then it will pulse exactly at 1kHz as the wave speeds up. That is, there will be no relation between the pulsing frequency or the output frequency, so with that ideal way of pulsing, you won't get the sound on modern trains. It's only to do with the way it pulses, there is no difference in the way it works; no difference in the way that GTO-VVVF or IGBT-VVVF inverters work. The only difference is that IGBT-VVVF inverters are much faster and pulse without any losses; the perfection of programming the VVVF drives on modern-day trains is the only reason why they don't make that sound. To always pulse at a set frequency, we may have to pinpoint exactly where the pulses on really fast waves are, meaning that on some trains we might have to switch back to the old-fashioned pattern based pulsing upon reaching a certain speed. When we start with perfectionist pulsing, the wave is made by changing how long it pulses for between 0 and 100%, but as the wave speeds up, those pulses are entirely fixed. Then upon reaching a certain speed, as mentioned earlier, switches back to pattern based pulsing to obtain the precise pinpoints on where it pulses. And again, an example of a train that does this is the Bombardier MOVIA Toronto Rocket.
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Toronto and Sydney, Australia's subway systems are very similar. Perth, Australia and Vancouver's train transit systems are also a tie-good too.
Newtrainoldtrain
Filled with packed trains
Man, after being raised in both cities, I know my way around the TTC (Toronto Transit Commission) and the CTA (Chicago Transit Authority) like no ones business.
The TTC amazing
Is it the same RTD bus as the Vine in Vancouver M,WA?
nice
Rrrrrtrex to keele
DO YOU HAVE QUESTION ABOUT PRESTO??? VIST GDC DOT CA SLASH PRESTO TO LEARN MORE!!!!!!!!!!
...
KNSubway
Jgm
🚇🇨🇦
fact ttc workers dont have the right to go on strike
We at collegestn
Is raining outside
@@genie1278 ok
One of the most ugliest subway...BUT efficient and so safe!!!
The TTC has some aging sections, but to call it ugly, or even the ugliest is stretching. Compared to NYC it's practically the Moscow Subway.
Paul Girard the bloor danforth is worse but Dufferin and Pape are some nice stations