BOSTON · LINE REPORT · RANK 5 OF 5
Green Line76 out of 100.
Mostly steady.
B, C, D and E branches. Measured across 77,310 trips and 697,805 stop observations from Aug 20, 2026 through Sep 18, 2026.
76/100Mostly steady
BALANCED ARRIVALS64.2%within 0.5–1.5× scheduled headway
LONG GAPS18.8%above 1.5× scheduled headway
BUNCHING17.1%below 0.5× scheduled headway
ON-PACE SEGMENTS99.3%no more than 2 minutes slow
DAILY METER
Thirty service days
The latest seven-day score improved by 1.4 points compared with the first seven days.
Aug 20, 2026Sep 18, 2026
READING THE LINE
What the score captures
On Green Line, the median observed interval between comparable arrivals was 7.8 minutes. The median measured segment ran 53 seconds under schedule.
The daily score can move because headways spread out, trains bunch together, or station-to-station travel slows. It does not assign a cause without supporting incident, construction or weather evidence.
Audit the complete formula →LATEST DAY · Sep 18, 2026
78daily score
67.0%balanced arrivals
16.8%long gaps
99.3%on-pace segments
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