Toronto Spadina Subway Extension Emergency Exits | ?m | 1s | TTC | IBI Group

aquateam said:
Driverless operation means that the streetcars actually manage a consistent headway, and since Spadina/Harbourfront/St Clair operate in their own ROW it should be easier to implement.
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That's not necessarily true. Driverless subway systems still experience bunching. The primary cause of bunching isn't bad drivers, but rather inconsistent passenger loads. If a platform is full when a train pulls into a station, it take longer to board/alight all those passengers. But if a train pulls into the same station while the platform happens to be empty, it will take a much shorter amount of time for those passengers to board/alight.
 
TheTigerMaster said:
That's not necessarily true. Driverless subway systems still experience bunching. The primary cause of bunching isn't bad drivers, but rather inconsistent passenger loads. If a platform is full when a train pulls into a station, it take longer to board/alight all those passengers. But if a train pulls into the same station while the platform happens to be empty, it will take a much shorter amount of time for those passengers to board/alight.
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Just to be clear, I'm not saying bad drivers are to blame. I'm aware how small delays snowball into bunching (delays cause more delays for the leading vehicle since they need to pick up more passengers, while speeding up the trailing vehicle which has to pick up fewer passengers). And automated subways can bunch. But none of those automated subways are operating on a communications based control system, they're going at their own speed unless a red signal tells them they can't go forward.

I would expect a well-designed automated system to be closed loop, not open loop, and to adjust its operating speed based on the position of other trains in order to maintain a headway. If the streetcar starts running slightly ahead of schedule, it would detect it and slow down imperceptibly, or dwell slightly longer at stops, to maintain a consistent headway between it and the train in front/behind. Or it could speed up or demand a higher signal priority depending on how far behind schedule it is. As long as a train isn't expected to be running always at full speed then there should be enough margin for it to adjust.

Also, according to Steve Munro's analysis of the 510 and 512, much of the problems arise from how they are dispatched, and adding headway managers to the routes greatly improved performance. An automated system would be like having headway managers at every stop.
 
aquateam said:
Also, according to Steve Munro's analysis of the 510 and 512, much of the problems arise from how they are dispatched, and adding headway managers to the routes greatly improved performance. An automated system would be like having headway managers at every stop.
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An automatic system can be programmed to maintain proper headway. Oh wait, that's too advance for the TTC.
 
The death of a construction worker on the Spadina extension in 2011, delayed construction a year and increased the costs.

In South Korea, on Wednesday,
4 Dead, 10 Hurt in South Korean Construction Explosion

See link.

Four people died and 10 others were injured after an explosion at a subway construction site on Wednesday near the South Korean capital of Seoul.

The workers were welding iron bars 15 meters (49 feet) underground when the explosion occurred in the morning, said officials from the Gyeonggi Province Fire and Disaster Headquarters, who didn't want to be named, citing office rules.

One worker was found dead above ground, his body possibly blown upward by the force of the explosion, while three others were found dead underground. Three of the injured were seriously hurt, the officials said.

The cause of the explosion wasn't immediately known. An official from the Namyangju fire department, who also didn't want to be named, citing office rules, said a gas tank used for the welding operations might have exploded.

The accident is the latest addition into a long list of deadly safety accidents in South Korea, where, despite a period of soul-searching after a 2014 ferry disaster that killed more than 300 people, safety issues continue to be overlooked.

There was public outrage about the death of a 19-year-old subway worker who was hit by a subway train on Saturday while doing maintenance work on screen doors on a station platform in Seoul. Critics have questioned the labor policies at Seoul Metro, the subway operator, asking why the man was working alone when safety regulations require at least two for such jobs.

Analysts say many safety problems in the country stem from little regulation and wide ignorance about safety in general — and a tendency to value economic advancement over all else.
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Don't expect to see the same time delays, or cost increases in South Korea, compared with Toronto.
 
W. K. Lis said:
The death of a construction worker on the Spadina extension in 2011, delayed construction a year and increased the costs.

In South Korea, on Wednesday,
4 Dead, 10 Hurt in South Korean Construction Explosion

See link.



Don't expect to see the same time delays, or cost increases in South Korea, compared with Toronto.
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Did you totally ignore the last line in the article? There's a reason we have delays after fatalities.
 
P23 said:
Did you totally ignore the last line in the article? There's a reason we have delays after fatalities.
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Exactly!

Yet there are people who keep saying "hurry up, hurry up" and wonder why there are these extra people (safety inspectors, for example) just standing around with their arms against a wall? Holding up the wall?

 
W. K. Lis said:
Exactly!

Yet there are people who keep saying "hurry up, hurry up" and wonder why there are these extra people (safety inspectors, for example) just standing around with their arms against a wall? Holding up the wall?

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Ahh, ok. I assumed you were being sincerely ignorant.
 
I just passed Finch west station the other day and man....the thing is MASSIVE.....
maybe too massive for such a small station IMO.....
 
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