BOSTON · LINE REPORT · RANK 2 OF 5
Orange Line91 out of 100.
Steady.
Oak Grove to Forest Hills. Measured across 12,803 trips and 174,760 stop observations from Aug 20, 2026 through Sep 18, 2026.
91/100Steady
BALANCED ARRIVALS86.6%within 0.5–1.5× scheduled headway
LONG GAPS8.7%above 1.5× scheduled headway
BUNCHING4.7%below 0.5× scheduled headway
ON-PACE SEGMENTS99.8%no more than 2 minutes slow
DAILY METER
Thirty service days
The latest seven-day score improved by 2.4 points compared with the first seven days.
Aug 20, 2026Sep 18, 2026
READING THE LINE
What the score captures
On Orange Line, the median observed interval between comparable arrivals was 5.5 minutes. The median measured segment ran 45 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
90daily score
85.0%balanced arrivals
8.4%long gaps
99.8%on-pace segments
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