Red Line

Crawling Along: Introducing the Slow Zone Tracker

Crawling Along: Introducing the Slow Zone Tracker

Tracking Slow Zones on the MBTA

Do you ever find yourself sitting on a subway car that is just crawling along? Maybe you’re running slightly late already. And maybe you start to wonder… “Surely it hasn’t always been this slow. Is it just my train? Has it been like this the whole week? Is it getting worse?”

The TransitMatters Labs team is happy to announce a new tool that answers these questions. Our new Slow Zone Tracker makes it easy to tell when trains are running consistently slower than usual.

Slow zones on a rail line usually pop up due to infrastructure problems such as poor track condition, signal failure, or power issues. For example, StreetsblogMASS recently reported that the Orange Line has been given a lower speed limit in some sections due to deteriorating track conditions. And in 2019, for instance, the Red Line was severely delayed after the June 11 derailment took the signal system offline.

Our line graph gives a high-level overview of these sorts of systemic slow downs—how much time is being lost compared to how fast the trains theoretically could run? Is it getting better or worse over time?

Switching to the segment view allows you to dig in deeper: which pairs of stops are seeing delays, and how bad are they?

Clicking on one of the bars will take you to the data-dashboard page where you can see the data itself. In most cases, it will look something like this:

Or like this:

In some cases, severity may vary over time. Our algorithm looks at dwell times in addition to travel times, since waiting longer than usual at a station also counts as a delay. 

Our algorithm isn’t perfect, of course. If you notice any issues or want to send any other feedback, let us know at labs@transitmatters.org.


FAQ:

What is this?

This is a tool to help find and track slow zones. That is, areas where trains have lower-than-usual speeds due to track conditions, signal issues, or other infrastructure problems.

How do we calculate this?

We look at the daily median travel time + dwell time for each segment along a route. Whenever that trip time is at least 10% slower than the baseline for 3 or more days in a row, it gets flagged as a slow zone. Currently, our baseline is the median value in our data, which goes back to 2016. It’s not a perfect system, but various algorithmic improvements are in the works.

Why did we build this?

There’s power in data, but it’s only useful when you can tell a story. Slow zones are a nice story to tell: they tie our observable results to a cause. With so much data available, it can be difficult to find the interesting bits. So we’ve built this tool to help us locate and track this type of issue (slow zones), and monitor the severity over time.

How can you use this?

Share it. Bring the data to public meetings. Pressure the T to do better, but also give them credit where it’s due.

What about the Green Line?

Due to variable traffic, much of the Green Line doesn’t have consistent enough trip times to measure. As for the main trunk and the D line? Coming “soon”.

Media Statement: Recent Derailments

BOSTON, June 11, 2019 — Today’s Red Line derailment was the latest in a recent series of derailments and possibly related switch and signal failures on both the Red and Green Lines.  These incidents compromise public safety and are setbacks for those who seek a public transit system that is reliable, resilient and responsive to the needs of people throughout Metro Boston. The frequency and impact of these failures is causing a loss of confidence in the T and calls into question whether and how the MBTA and City of Boston are prepared to respond effectively to the immediate disruptive consequences of derailments and other similar events. TransitMatters is calling today for the FMCB to promptly address these issues by undertaking an expedited independent review of MBTA systems and operations and management protocols covering both the causes of these derailments and the approach to managing their immediate mobility impacts. We know that running a large, old and chronically underinvested transit system is a challenging job, but we cannot accept the service failures of the last few weeks as a new normal. These issues require a prompt forensic deep dive, a report to the public, and action for more funding by the legislature to target accelerated repair and modernization of the system.

For media inquiries, please email: info@transitmatters.org
Photo: James Fisher

Mixed Feelings About Longfellow Reconstruction Process

[youtube=http://www.youtube.com/watch?v=VQsyPClwVj8] Tuesday evening, MassDOT hosted an informational meeting at Shriners Hospital as part of its community outreach to provide details on the upcoming Longfellow Bridge reconstruction. Plans were initially introduced in February and MassDOT is working to ensure that the public is well aware of the disruptions for the next three years that will restore a regional landmark. Not everyone walked away happy from the meeting though, especially car-dependent locals and advocates of the cycling community.

The Longfellow Bridge is the only bridge in Massachusetts that carries cars, trains, and pedestrians across the Charles River and one of the oldest in the Commonwealth. Opened on my birthday 107 years ago, 3 August 1906, the bridge has been neglected for nearly a century as many of the Commonwealth's other bridges. It's a critical link in the region's transport network, carrying over 28 thousand autos each day and over three times that in Red Line passengers in addition to scores of pedestrians and cyclists who enjoy the picturesque views of Boston into Charles Circle.

The last time heavy work was done on the bridge was in 1959 and that rehab was only supposed to last 50 years. This reconstruction, scheduled to be completed in 2016 at the cost of over $255 million, should last 75 years and will bring some much-needed improvements to modernise the bridge, including wider pedestrian paths and wide, buffered bike lanes on both sides of the bridge. Sedimentation basins will even be installed at the ends of the bridge to catch and filter the rain runoff from the bridge, cleaning the oil-slicked water before it gets dumped into the Charles.

A significant amount of attention will be paid to the historical elements of the bridge, requiring the careful disassembly of various decorative bridge components, from railings to cladding, and hand-restoring them off-site. The masonry of the bridge's iconic towers will also be removed block-by-block for cleaning and restoration.

A new pedestrian bridge will also be installed next to the bridge to replace the existing bridge that spans over Storrow Drive to provide wheelchair accessibility from Charles Circle to the Esplanade. The bridge will be built adjacent the existing pedestrian bridge and will open in 2015.

But what about the bikes?...

Restoration is being handled by the joint venture of White, Skanska, and Consigli. All three are high profile engineering and construction contractors, but are any of them up to the task of managing pedestrian and bicycle infrastructure? White has built much of Boston's significant infrastructure projects, but most of those projects have been auto-oriented or large transit projects and none appear to have as much mode mixing as that at the approaches of the Longfellow Bridge. Tetratech will be providing traffic design for the project, but no experts in pedestrian or bicycle infrastructure design have been brought onto the project.

Bicycle advocates from MassBike and LivableStreets brought into question the approaches at the end of the bridge during construction for pedestrians and bikes and when those designs would be available for public comment. The engineers from the joint venture noted that during the final phase at 75% of design completion, there would be an opportunity for public comment, but this was only for the final bridge approach design. The group claimed interim plans for the bridge approaches already take into account public concerns about bike and pedestrian infrastructure, but they did not actually present how the approaches will look during each phase of construction, which was the focus of this informational meeting. '[The interim approaches] will be reviewed by public safety officials', said one of the presenters who later clarified those would include traffic engineers, fire department officials , and police officials, but not there will not be any opportunity for public input before construction begins.

And the cars?...

Another incendiary point of the evening was the fact that all Cambridge-bound traffic would be eliminated for all 3 years of construction. One Beacon Hill resident claimed the plan was 'incomprehensible', noting 'it’s a disaster lots of times just to get home' and further exclaiming it would significantly hinder her ability to leave the city, even with the planned detours over the adjacent Craigie Bridge. One alternate route was to direct traffic across the Harvard Bridge via Mass Ave to get to Cambridge, which as scoffed at by at least one attendee.

As a nation, we've been driving less month over month since 2004. Commissioner Thomas Tinlin of the Boston Transportation Department was there to assure her that traffic shouldn’t be as severe as she anticipates, considering the fact that stats barely flinched when one Cambridge-bound lane was closed on the bridge as a live test. Though not an official announcement, he suggested there was time before the actual bridge closure to do a live test of an entire Cambridge-bound bridge closure.

Through thick and thin, the trains will run (except for 25 weekends)

Despite auto lane closures and 25 planned weekend service diversions, the Red Line will still run in some shape or form. Dedicated bus lanes and an additional 20 buses purchased by MassHighway are planned to run during weekend service diversions per construction planning by the joint venture. Contrary to the plans noted by the Globe, the phasing appears to permit the weekend shuttles to run in both directions over the bridge instead of only one direction with the other routed over the congested Craigie Bridge. It's still up to the MBTA to determine how they'll manage the weekend service diversions and whether Red Line trains will run between Kendall and Park or Kendall and Charles-MGH.

There is a point where trains can cross over between Park and Charles-MGH so the latter is more likely since Charles would offer operations to run more like the terminal at Alewife, where trains can enter the station on either side and turn around and cross over to the correct track before reaching the next station. Let's hope for the shuttle to go between Kendall and Charles-MGH since past shuttles between Kendall and Park have been nightmares due to the number of lights and awkward routing between Charles-MGH and Park for shuttle busses.

Unfortunately for one gentleman who has lived adjacent Charles Circle for over 40 years, there's no relief in sight, including the 2 years of various phases where the Red Line will be running on temporary 'shoofly tracks' right on the road itself. The new bridge construction will not include any noise abatement walls along the tracks, so the people who live at Charles Circle won't get any relief, at least for the next 75 years.

Tuesday evening was one of the last meetings held by MassDOT before rehabilitation begins on the bridge this June.