At California (Green), toward Harlem/Lake, between 8:32 pm and 8:33 pm. The schedule called for a train every 10 min.
Line
Green Line
Station
California (Green) (station 41360)
Direction
toward Harlem/Lake
Train before
run 617, passed 8:32:39 pm
Train after
run 611, passed 8:33:54 pm
Gap
1 min (75 s)
Scheduled gap
10 min
Collector
running the whole time
Scheduled against seen
Each tick is a train at California (Green) toward Harlem/Lake. The two runs either side of the bunch are labeled.
What Train Tracker said
Train Tracker reports each train's next stop. A train has passed California (Green) when its next stop moves past it.
Snapshot
Run 617 (before)
Run 611 (after)
8:31:09 pm
next stop California (Green)
next stop Ashland (Green/Pink)
8:32:09 pm
next stop California (Green)
next stop Damen (Green)
8:33:09 pm
next stop Kedzie (Green)
next stop Damen (Green)
8:34:09 pm
next stop Kedzie (Green)
next stop Kedzie (Green)
8:35:09 pm
next stop Pulaski (Green)
next stop California (Green)
Showing 5 of 5 snapshots in the gap. The full record, every train on the line minute by minute, is in 2026-10-10-green-bunch-74034.json.
Check it yourself
Scheduled times come from CTA's GTFS schedule for Sat Oct 10. Positions come from Train Tracker, polled once a minute.
The raw records above are exactly what CTA's servers returned. How the numbers are worked out.