BOSTON · LINE REPORT · RANK 3 OF 5
Blue Line91 out of 100.
Steady.
Wonderland to Bowdoin. Measured across 11,741 trips and 132,623 stop observations from Aug 20, 2026 through Sep 18, 2026.
91/100Steady
BALANCED ARRIVALS86.7%within 0.5–1.5× scheduled headway
LONG GAPS10.2%above 1.5× scheduled headway
BUNCHING3.1%below 0.5× scheduled headway
ON-PACE SEGMENTS99.5%no more than 2 minutes slow
DAILY METER
Thirty service days
The latest seven-day score improved by 1.7 points compared with the first seven days.
Aug 20, 2026Sep 18, 2026
READING THE LINE
What the score captures
On Blue Line, the median observed interval between comparable arrivals was 5.7 minutes. The median measured segment ran 33 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
89daily score
84.0%balanced arrivals
12.6%long gaps
99.5%on-pace segments
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