Green Line real-time data and tracking

Discussion relating to commuter rail, light rail, and subway operations of the MBTA.

Moderators: sery2831, CRail

Green Line real-time data and tracking

Postby StefanW » Thu Oct 23, 2014 1:06 pm

(Since the other thread was primarily about the count-down signs which aren't active on the Green Line today, I thought I'd start a new topic.)

deathtopumpkins wrote:Apparently above-ground Green Line tracking will go live this afternoon!

http://bostinno.streetwise.co/2014/10/2 ... real-time/

That's an unexpected surprise! Underground tracking is still scheduled for next year though.


Indeed it's live!

Check out my newest app, for Subway Live Tracking - including the above-ground Green Line!

http://sites.harvard.edu/~wuensch/T/subway-map.html
The Blue Line is good for Lynn, and Lynn is good for the Blue Line.

My live MBTA mapping apps:
https://sites.harvard.edu/~wuensch/T/commuter-rail-map.html
https://sites.harvard.edu/~wuensch/T/subway-map.html
User avatar
StefanW
 
Posts: 448
Joined: Wed Aug 18, 2004 8:27 pm
Location: Lynn, MA / MP 11.53

Re: Green Line real-time data and tracking

Postby Arlington » Thu Oct 23, 2014 6:51 pm

Hooray for the march of open information!
"Trying to solve congestion by making roadways wider is like trying to solve obesity by buying bigger pants."--Charles Marohn
Arlington
 
Posts: 3142
Joined: Wed Jun 02, 2004 7:51 am
Location: Medford MA (was Arlington MA and Arlington VA)

Re: Green Line real-time data and tracking

Postby StefanW » Wed Aug 12, 2015 12:00 pm

The Green Line Central Subway now appears to be fully covered by the newest phase of MBTA live tracking. The MBTA hasn't made an official announcement about it yet, but I thought I'd mention it here since the data don't lie. :-)

Example from my app:
Green Line Central Subway.png
Map of Green Line new live positions in Central Subway


http://sites.harvard.edu/~wuensch/T/subway-map.html
The Blue Line is good for Lynn, and Lynn is good for the Blue Line.

My live MBTA mapping apps:
https://sites.harvard.edu/~wuensch/T/commuter-rail-map.html
https://sites.harvard.edu/~wuensch/T/subway-map.html
User avatar
StefanW
 
Posts: 448
Joined: Wed Aug 18, 2004 8:27 pm
Location: Lynn, MA / MP 11.53

Re: Green Line real-time data and tracking

Postby Arlington » Wed Aug 12, 2015 12:54 pm

StefanW wrote:The Green Line Central Subway now appears to be fully covered by the newest phase of MBTA live tracking. The MBTA hasn't made an official announcement about it yet, but I thought I'd mention it here since the data don't lie. :-)

Yippee!
"Trying to solve congestion by making roadways wider is like trying to solve obesity by buying bigger pants."--Charles Marohn
Arlington
 
Posts: 3142
Joined: Wed Jun 02, 2004 7:51 am
Location: Medford MA (was Arlington MA and Arlington VA)

Re: Green Line real-time data and tracking

Postby Gerry6309 » Wed Aug 12, 2015 2:00 pm

Arlington wrote:
StefanW wrote:The Green Line Central Subway now appears to be fully covered by the newest phase of MBTA live tracking. The MBTA hasn't made an official announcement about it yet, but I thought I'd mention it here since the data don't lie. :-)

Yippee!

All of the lines seem to have some digital black-holes, especially when trains are at terminals, awaiting departure. There are also occasional phantom trains which don't show up at all.

From that, I assume that a reverse key has to be in forward for the lead car to show up.
Gerry. STM/BSRA

The next stop is Washington. Change for Forest Hills Trains on the Winter St. Platform, and Everett Trains on the Summer St. Platform. This is an Ashmont train, change for Braintree at Columbia.
User avatar
Gerry6309
 
Posts: 1484
Joined: Wed Jun 13, 2007 10:46 pm
Location: Boston

Re: Green Line real-time data and tracking

Postby diburning » Wed Aug 12, 2015 2:24 pm

A few trains have passed me at park street. None of them showed up on the tracker. I bet not every car is set up yet.
User avatar
diburning
 
Posts: 2950
Joined: Sat Feb 09, 2008 7:37 pm
Location: Practicing safe CSX by using Three-Step Protection

Re: Green Line real-time data and tracking

Postby StefanW » Wed Aug 12, 2015 4:13 pm

diburning wrote:A few trains have passed me at park street. None of them showed up on the tracker. I bet not every car is set up yet.


It is correct that not every car will register, but every train is supposed to show up - with the lead car displayed. The MBTA data operations people explained how it's supposed to work...
- above ground the GPS unit in each Type 8 will send its position, and the AVI site at the trip origin will kick off the train as being "known" for that trip.
- underground the signal blocks indicate car / train location, and the AVI sites (which are more numerous underground) will handle the ID.

Note that (according to the MBTA) all Type 8 cars have the GPS units installed, but only some Type 7s have GPS installed. Since almost all trips have at least one Type 8 in the train, it's believed that 99% of revenue trips will be tracked above-ground.

To handle underground, a significant number of brand new AVI sites have been installed. According to the MBTA, as of last month there were only two remaining AVI sites that were not finished being installed. However, I have not heard whether there is now an AVI site for every signal block. I would bet probably not, since they are really only needed where there are converging / diverging routes. The signal blocks ought to handle the tracking in-between AVI sites.

The MBTA people also said that Park St. is the single most difficult area to deal with tracking the trains. It's because of the wall / fence westbound split, plus the loop. Seeing as the official MBTA announcement about the Central Subway live tracking data hasn't happened yet, I'm guessing they are working out some final issues in the area around Park St.
The Blue Line is good for Lynn, and Lynn is good for the Blue Line.

My live MBTA mapping apps:
https://sites.harvard.edu/~wuensch/T/commuter-rail-map.html
https://sites.harvard.edu/~wuensch/T/subway-map.html
User avatar
StefanW
 
Posts: 448
Joined: Wed Aug 18, 2004 8:27 pm
Location: Lynn, MA / MP 11.53

Re: Green Line real-time data and tracking

Postby StefanW » Wed Aug 12, 2015 5:39 pm

diburning wrote:A few trains have passed me at park street. None of them showed up on the tracker. I bet not every car is set up yet.


I think I know what might have happened. It seems like the artificial "GPS" position data that the MBTA applies to each underground signal block is not very granular. In other words... many Green Line trains are showing up on my map view right on top of each other because they are getting the same exact "GPS" position applied and sent. This seems to be happening most noticeably at Park because each platform track can have multiple trains. I'm also not sure if the T is sending different positions for each of the four tracks.

I was at Park St. about 25 min. ago and all three eastbound trains had live tracking. (A two-car on track 3 loop headed by Type 7, two-car on track 4 out of service headed by Type 7, and a Lechmere train on track 4 headed by a Type 8.) All three of those were on my map, but the icons were all in exactly the same spot so it was almost impossible to tell!

I think I know a way I can tweak my map view to account for multiple train icons in the same spot. I don't want to play with the raw position data but I think I can come up with a way to prevent totally overlapping icons.

Keep the feedback coming!!! The more specific you all can be about what you see (or don't see) will help me make app improvements. Thanks!
The Blue Line is good for Lynn, and Lynn is good for the Blue Line.

My live MBTA mapping apps:
https://sites.harvard.edu/~wuensch/T/commuter-rail-map.html
https://sites.harvard.edu/~wuensch/T/subway-map.html
User avatar
StefanW
 
Posts: 448
Joined: Wed Aug 18, 2004 8:27 pm
Location: Lynn, MA / MP 11.53

Re: Green Line real-time data and tracking

Postby StefanW » Wed Aug 12, 2015 5:47 pm

Also - try clicking on the "Show a detailed table" button below the map, then sort the table on the "Lead Car No." column by clicking on the column heading. That way you can search by car number if you're trying to find something specific. Obviously that doesn't help if you're browsing for trains by location, but at least you can find out if the train you're looking at is being tracked or not.
The Blue Line is good for Lynn, and Lynn is good for the Blue Line.

My live MBTA mapping apps:
https://sites.harvard.edu/~wuensch/T/commuter-rail-map.html
https://sites.harvard.edu/~wuensch/T/subway-map.html
User avatar
StefanW
 
Posts: 448
Joined: Wed Aug 18, 2004 8:27 pm
Location: Lynn, MA / MP 11.53

Re: Green Line real-time data and tracking

Postby StefanW » Wed Aug 12, 2015 8:45 pm

StefanW wrote:It seems like the artificial "GPS" position data that the MBTA applies to each underground signal block is not very granular. In other words... many Green Line trains are showing up on my map view right on top of each other because they are getting the same exact "GPS" position applied and sent. This seems to be happening most noticeably at Park because each platform track can have multiple trains. I'm also not sure if the T is sending different positions for each of the four tracks.


Correction: I've figured out that the MBTA's live tracking isn't online yet between Arlington and Park Street. I've observed eastbound trains "piling up" at Arlington, and westbound trains "piling up" just before Park Street. In both cases the trains will jump across that route section and appear with live position data on the other side. This tells me that the AVI sites and/or tie-in to the signal blocks isn't quite done yet.
The Blue Line is good for Lynn, and Lynn is good for the Blue Line.

My live MBTA mapping apps:
https://sites.harvard.edu/~wuensch/T/commuter-rail-map.html
https://sites.harvard.edu/~wuensch/T/subway-map.html
User avatar
StefanW
 
Posts: 448
Joined: Wed Aug 18, 2004 8:27 pm
Location: Lynn, MA / MP 11.53

Re: Green Line real-time data and tracking

Postby ns3010 » Thu Aug 13, 2015 11:09 am

Countdowns at Kenmore went live this morning. Arrival times for the surface sections B and C (along with D) are also available on at least a few apps I have tried. Nothing new for the E or rest of the central subway.
User avatar
ns3010
 
Posts: 1961
Joined: Sun Dec 21, 2008 12:53 pm
Location: MP 226.5

Re: Green Line real-time data and tracking

Postby StefanW » Thu Aug 20, 2015 10:15 am

ns3010 wrote:Countdowns at Kenmore went live this morning. Arrival times for the surface sections B and C (along with D) are also available on at least a few apps I have tried. Nothing new for the E or rest of the central subway.


According to the MBTA, real-time predictions are now available for Hynes. I agree, because they are showing up in the data.

They actually said "at Hynes" which makes me think the countdown signs in the station are also active. Anyone seen them yet?
The Blue Line is good for Lynn, and Lynn is good for the Blue Line.

My live MBTA mapping apps:
https://sites.harvard.edu/~wuensch/T/commuter-rail-map.html
https://sites.harvard.edu/~wuensch/T/subway-map.html
User avatar
StefanW
 
Posts: 448
Joined: Wed Aug 18, 2004 8:27 pm
Location: Lynn, MA / MP 11.53

Re: Green Line real-time data and tracking

Postby ns3010 » Thu Aug 20, 2015 10:45 am

StefanW wrote:
ns3010 wrote:Countdowns at Kenmore went live this morning. Arrival times for the surface sections B and C (along with D) are also available on at least a few apps I have tried. Nothing new for the E or rest of the central subway.


According to the MBTA, real-time predictions are now available for Hynes. I agree, because they are showing up in the data.

They actually said "at Hynes" which makes me think the countdown signs in the station are also active. Anyone seen them yet?



They are indeed: https://twitter.com/MBTA/status/634380928060665857
User avatar
ns3010
 
Posts: 1961
Joined: Sun Dec 21, 2008 12:53 pm
Location: MP 226.5

Re: Green Line real-time data and tracking

Postby Adams_Umass_Boston » Thu Aug 20, 2015 9:25 pm

Following up with a yes, they even announce the "next train to Park is now arriving" No approaching announcements though.

Its my daily station.
User avatar
Adams_Umass_Boston
 
Posts: 858
Joined: Tue Apr 20, 2004 11:26 am
Location: Eastie

Re: Green Line real-time data and tracking

Postby The EGE » Tue Oct 06, 2015 1:56 pm

Much of the Central Subway is going live this week. Arlington and Copley both directions today; Boylston and Park eastbound tomorrow; Haymarket, NS, and Science Park eastbound on Thursday.
"Give me an unobstructed right-of-way and I'll show them how to move the earth!"
User avatar
The EGE
 
Posts: 2443
Joined: Wed Feb 16, 2011 6:16 pm
Location: Waiting for the C Branch

Next

Return to Massachusetts Bay Transportation Authority (MBTA)

Who is online

Users browsing this forum: BandA, keith, RenegadeMonster and 6 guests