Morning rush
13 min 674 trips · 95% on paceOBSERVED MBTA TRAVEL TIME · 30 SERVICE DAYS
Back BaytoAssembly
Orange Line
A direct MBTA train from Back Bay to Assembly took a median 13 minutes across 2,952 observed trips; 90% of measured rides finished within approximately 15 minutes.
Source: MBTA Performance Data · 2026-08-20 to 2026-09-18 · Completed direct trips only
Typical13 min50th percentile
Slower trip15 min90th percentile
Scheduled14 minmedian timetable
On pace96%within 2 min of schedule
THE SHORT ANSWER
How long does Back Bay to Assembly take?
The median completed ride from Back Bay to Assembly was 13 minutes; the published schedule’s median was 14 minutes.
Based on 2,952 direct trips between 2026-08-20 and 2026-09-18, the median observed ride was 13 minutes. That was within 1 minutes of the published schedule.
Nine out of ten measured trips finished within approximately 15 minutes. These figures describe completed direct trips; they do not include the time spent waiting for the train.
WHEN YOU TRAVEL
Back Bay to Assembly times by daypart
Midday produced the fastest median for Back Bay to Assembly; Evening rush produced the slowest.
Differences can change as the rolling dataset updates.
Midday
13 min 684 trips · 95% on paceEvening rush
14 min 664 trips · 96% on paceOff-peak
13 min 930 trips · 97% on paceMEASUREMENT SAMPLE
How Back Bay to Assembly was measured
The Back Bay to Assembly estimate uses 2,952 completed direct-trip stop-timestamp pairs matched to the schedule active for each observed train.
We publish the median because one dramatic delay should not define an everyday journey, and the 90th percentile because riders still need to understand the bad end of normal.
We do not infer why a trip ran slowly. Construction, incidents, crowding and weather require separate evidence.
Read the complete method →MORE FROM Back Bay
Trips related to Back Bay to Assembly
The Back Bay to Assembly record is accompanied by 6 other measured direct rides beginning at Back Bay, each with a published median duration.