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Old 11-07-2015, 04:51 PM
 
Location: In your feelings
2,199 posts, read 1,588,533 times
Reputation: 2169

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2014:
Quote:
Originally Posted by magnetar View Post
First half 2015:
Quote:
Originally Posted by Pemgin View Post
Just noticed another interesting detail in the numbers: every city that saw larger ridership increases than Atlanta did last year, has seen slower growth or declines this year. And Atlanta had the highest ridership gain of all the cities that are seeing larger increases than they did last year. MARTA's gains are statistically significant on both a local and national level.

Last edited by magnetar; 11-07-2015 at 05:08 PM..
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Old 11-07-2015, 07:36 PM
 
Location: Georgia
5,208 posts, read 4,265,952 times
Reputation: 3011
Quote:
Originally Posted by skbl17 View Post
Actually, the slow zone isn't about wobbling trains, or else the slow zone would be permanent. MattCW and I have pointed this out a lot, but the trains on that stretch emerge from the tunnel, the speed limit drops to 50, then 37, then 25 for a ~1 mile stretch between I-85 and the bend where the line turns away from I-85. Wobbling isn't the problem, because the trains on the Red Line travel handle that curve between Medical Center and GA 400 at speeds of ~55 just fine.

It's even worse on the Blue Line between East Lake and Avondale, where the train just slogs along at ~20 mph for that entire stretch.

- skbl17
Are you sure that that slow zone has nothing to do with the wobbling at full speed? I remember taking that stretch at full speed, and I swear, at times, it feels like the train is about to derail. I've never felt anything like that in the tunnel southwest of Medical Center.

Honestly I think it's the tracks themselves. I believe that MARTA is trying to replace the entire set of tracks over the next few years, hence all the single-tracking on the weekends.
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Old 11-07-2015, 07:45 PM
 
Location: Decatur, GA
5,255 posts, read 4,006,417 times
Reputation: 2790
Quote:
Originally Posted by toll_booth View Post
Are you sure that that slow zone has nothing to do with the wobbling at full speed? I remember taking that stretch at full speed, and I swear, at times, it feels like the train is about to derail. I've never felt anything like that in the tunnel southwest of Medical Center.
Um, I used to ride that section daily and never encountered any excessive swaying.
Quote:
Honestly I think it's the tracks themselves. I believe that MARTA is trying to replace the entire set of tracks over the next few years, hence all the single-tracking on the weekends.
They have been doing this since 2003! THEY HAVE HAD TIME TO REPLACE EVERY INCH OF RAIL IN THE SYSTEM!!!
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Old 11-07-2015, 07:58 PM
 
Location: Just outside of McDonough, Georgia
1,057 posts, read 845,970 times
Reputation: 1315
Quote:
Originally Posted by toll_booth View Post
Are you sure that that slow zone has nothing to do with the wobbling at full speed? I remember taking that stretch at full speed, and I swear, at times, it feels like the train is about to derail. I've never felt anything like that in the tunnel southwest of Medical Center.
There are sharper curves on the MARTA system (GA 400 -> Medical Center, the approach to Sandy Springs from the southeast, the curve between Lenox and Brookhaven/Oglethorpe) that the trains zip through at 50-65 just fine. If wobbling was the concern, then the 25mph slow zones would be more prevalent throughout the system. Even the sharp curve on the Gold Line just after the split with the Red Line has a speed limit of 45-50.

Honestly, I've never noticed any excessive swaying, and I like to stand at the front of the first car a lot.

- skbl17
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Old 11-07-2015, 08:02 PM
 
Location: Georgia
5,208 posts, read 4,265,952 times
Reputation: 3011
Quote:
Originally Posted by MattCW View Post
Um, I used to ride that section daily and never encountered any excessive swaying.

They have been doing this since 2003! THEY HAVE HAD TIME TO REPLACE EVERY INCH OF RAIL IN THE SYSTEM!!!
Quote:
Originally Posted by skbl17 View Post
There are sharper curves on the MARTA system (GA 400 -> Medical Center, the approach to Sandy Springs from the southeast, the curve between Lenox and Brookhaven/Oglethorpe) that the trains zip through at 50-65 just fine. If wobbling was the concern, then the 25mph slow zones would be more prevalent throughout the system. Even the sharp curve on the Gold Line just after the split with the Red Line has a speed limit of 45-50.

Honestly, I've never noticed any excessive swaying, and I like to stand at the front of the first car a lot.

- skbl17
Really?? To be specific, I'm not talking about the curve just north of the Arts Center tunnel exit. I'm talking about a stretch of rail about a mile or so north of that. I mean, I'll admit that it only got bad in recent years, but still. Maybe at certain speeds--40, 50, whatever--you can't feel much wobbling through there. Most of the rest of the Red and Gold Lines are smooth as silk at normal speeds.
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Old 11-07-2015, 08:25 PM
 
Location: Decatur, GA
5,255 posts, read 4,006,417 times
Reputation: 2790
Quote:
Originally Posted by skbl17 View Post
There are sharper curves on the MARTA system (GA 400 -> Medical Center, the approach to Sandy Springs from the southeast, the curve between Lenox and Brookhaven/Oglethorpe) that the trains zip through at 50-65 just fine. If wobbling was the concern, then the 25mph slow zones would be more prevalent throughout the system. Even the sharp curve on the Gold Line just after the split with the Red Line has a speed limit of 45-50.
Actually, I believe the segment between the Red/Gold junction and Lenox is 60, I know it is southbound, it doesn't drop back down until maybe 500 feet south of the crossover and then I think it only drops to 50.

Quote:
Originally Posted by toll_booth View Post
Really?? To be specific, I'm not talking about the curve just north of the Arts Center tunnel exit. I'm talking about a stretch of rail about a mile or so north of that. I mean, I'll admit that it only got bad in recent years, but still. Maybe at certain speeds--40, 50, whatever--you can't feel much wobbling through there. Most of the rest of the Red and Gold Lines are smooth as silk at normal speeds.
Yes toll_booth, we know exactly where you're talking about. It feels just as smooth as the segment down 400 between Buckhead and Medical Center which is also 70. When you hit the switches at the Lindbergh Pocket track, there's a bit more wobbling, but there's going to be especially if you're standing/seated right near the trucks of the car.
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Old 11-08-2015, 02:44 PM
 
Location: Orange Blossom Trail
6,416 posts, read 4,810,645 times
Reputation: 2635
Marta is doing well.
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