Mattapan Line led this window
Its 93/100 score reflects 89.7% balanced arrivals and 99.7% of measured segments running within two minutes of schedule.
Read the report →Boston MBTA trip-time guide
Real trip times from real completed rides.
See how long MBTA rail trips usually take, how much time to allow on a slower day, and how consistently each line is running.
Based on official MBTA records · Aug 17, 2026–Sep 15, 2026
123,477completed trips analyzed
1,271,764stop observations
30service days
5rail lines covered
Latest service picture
Boston line reliability
Scores combine evenly spaced arrivals with observed travel times. A higher score means more predictable service during this 30-day window.
RankLineBalancedGaps7-dayScore
01
Mattapan LineAshmont to Mattapan
89.7%balanced arrivals
6.8%long gaps
-2.7
93Steady
↗
02
Orange LineOak Grove to Forest Hills
85.8%balanced arrivals
9.5%long gaps
+5.4
91Steady
↗
03
Blue LineWonderland to Bowdoin
86.3%balanced arrivals
10.6%long gaps
+4.7
91Steady
↗
04
Red LineAlewife to Ashmont and Braintree
75.3%balanced arrivals
14.9%long gaps
-2.3
83Mostly steady
↗
05
Green LineB, C, D and E branches
63.6%balanced arrivals
19.4%long gaps
+2.9
76Mostly steady
↗
What the data shows
Three useful takeaways
Green Line was least steady
19.4% of comparable arrivals followed a gap longer than 1.5× the scheduled interval.
Read the report →Orange Line changed most
Its latest seven-day average moved +5.4 points versus the first seven days in this window.
Read the report →Transparent by design
The numbers should be easy to understand—and easy to audit.
Every report states its source, date window, sample size and calculation method. That makes each page useful to riders and checkable by reporters or researchers.
THE TRIP-TIME ATLAS
2,767 direct journeys.
Measured one by one.
Reliability is useful; the question riders actually ask is simpler: how long will my trip take? TransitMeter now answers that with completed-trip evidence, including a typical time and a slower-trip allowance.