BOSTON · LINE REPORT · RANK 4 OF 5
Red Line83 out of 100.
Mostly steady.
Alewife to Ashmont and Braintree. Measured across 14,074 trips and 221,462 stop observations from Aug 17, 2026 through Sep 15, 2026.
83/100Mostly steady
BALANCED ARRIVALS75.3%within 0.5–1.5× scheduled headway
LONG GAPS14.9%above 1.5× scheduled headway
BUNCHING9.7%below 0.5× scheduled headway
ON-PACE SEGMENTS98.6%no more than 2 minutes slow
DAILY METER
Thirty service days
The latest seven-day score declined by 2.3 points compared with the first seven days.
Aug 17, 2026Sep 15, 2026
READING THE LINE
What the score captures
On Red Line, the median observed interval between comparable arrivals was 6.1 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 15, 2026
79daily score
69.1%balanced arrivals
20.0%long gaps
98.0%on-pace segments
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