Discussion related to commuter rail and rapid transit operations in the Chicago area including the South Shore Line, Metra Rail, and Chicago Transit Authority.

Moderators: metraRI, JamesT4

  by Jeff Smith
 
https://www.progressiverailroading.com/ ... ion--58213
The Chicago Transit Authority (CTA) yesterday announced it will begin construction in fall of track foundations for the Red-Purple rail bypass, which will replace a century-old bypass north of Belmont Station.

The bypass will allow trains to operate faster on the Red, Purple and Brown lines. CTA also will be able to increase the number of trains operating during peak periods and ease overcrowding on rail cars, CTA officials said in a press release.
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The estimated $570 million bypass construction is part of the first phase of CTA’s Red Purple Modernization (RPM) project to rebuild its century-old rail system.
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  by Tadman
 
Gotta love Chicago. 100 years of running trains through here and now suddenly we need a flying junction. Never mind the train volume is lower and an entire railroad quit running through here since then.

Also this is the station where they pull 50' forward to the signal, thus rendering the platform useless to the train behind (it can't fit all the way in yet) but the leading train is 3/4 of the way off the platform and can't keep its doors open. Ergo the passengers stand and wait and miss connections to other trains.

Wish I could do my work that way.
  by GojiMet86
 
  by daybeers
 
Tadman wrote: Mon Aug 05, 2019 10:37 am Gotta love Chicago. 100 years of running trains through here and now suddenly we need a flying junction. Never mind the train volume is lower and an entire railroad quit running through here since then.

Also this is the station where they pull 50' forward to the signal, thus rendering the platform useless to the train behind (it can't fit all the way in yet) but the leading train is 3/4 of the way off the platform and can't keep its doors open. Ergo the passengers stand and wait and miss connections to other trains.

Wish I could do my work that way.
Every time a Brown Line train pulls out of Belmont, all Red & Purple line trains in both directions must stop. That destroys capacity and reliability. Isn't that why they're building the flyover for the Brown Line?

One thing I don't understand is I guess due to property acquisition limitations, as in not wanting to bulldoze too many residences and businesses, southbound Brown Line trains will still merge with the southbound Purple Line trains (westernmost track) just before Belmont.

I was in Chicago last weekend and they are doing an incredible amount of work. Aside from the train tracker estimations being messed up, the service was running fairly well considering there is so much going on right next to active tracks and temporary platforms.

I will be back in September. I imagine there will be more substantial changes to Red & Purple Line service by then after the bypass is complete, but it's not really known when that will be. Fall 2021 potentially. Will there be busing? Then they start rebuilding the southbound Red & Purple Line tracks before tackling the northbound, hopefully the whole project will be complete in 2024.
  by justalurker66
 
daybeers wrote: Thu Jun 10, 2021 11:03 amEvery time a Brown Line train pulls out of Belmont, all Red & Purple line trains in both directions must stop. That destroys capacity and reliability. Isn't that why they're building the flyover for the Brown Line?
That was the marketing pitch for the project.
  by ExCon90
 
In fact, the lack of a flyover would be precisely the reason why the train in Tadman's example is being held at the signal -- a Ravenswood train is crossing in front of it. Completion of the flyover removes that obstacle.
  by justalurker66
 
Watching the video there are a couple of times when a train is shown stopped and it is not obvious why. There are obvious blocks where a train can't move because of the left turn in front of traffic, There is also an example that won't be fixed where a purple stops for a brown to use the same platform track.

It seems that most of the work is "for the future" when the number of trains would exceed the old layout's capacity. So perhaps not needed today ... but as part of a huge project to rebuild and modernize the red/purple line it is an improvement worth doing.

I'd like to see what the traffic was like 100 years ago, long before CTA. How many trains per hour on each route through the interlocking? Was the interlocking different? There was a time when there was a third platform for southbound trains (used to force interurban passengers to go through fare gates to get to the "L" service).
  by daybeers
 
I think people forget they're going to spend three years reconstructing the Red & Purple Line tracks which will increase capacity and speed. Going through switches/an interlocking/one of the busiest rail junctions in the country wears on the tracks and cars, so this will decrease the amount of maintenance needed on those components substantially.

I'm really excited to see the flyover completed.
  by west point
 
GojiMet86 wrote: Mon Jun 07, 2021 11:20 am

The problems experienced at this interlocking is almost identical to the problems at New Rochelle that will become much more prevalent once MNRR starts service to NYP. Just imagine being east of New Rochelle looking west with the Hell gate route going off to the left.