BOSTON · LINE REPORT · RANK 4 OF 5
Red Line83 out of 100.
Mostly steady.
Alewife to Ashmont and Braintree. Measured across 14,176 trips and 221,836 stop observations from Aug 20, 2026 through Sep 18, 2026.
83/100Mostly steady
BALANCED ARRIVALS74.9%within 0.5–1.5× scheduled headway
LONG GAPS15.2%above 1.5× scheduled headway
BUNCHING9.9%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 2.4 points compared with the first seven days.
Aug 20, 2026Sep 18, 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 52 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
67.5%balanced arrivals
20.3%long gaps
97.6%on-pace segments
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