At Sox-35th, toward 95th/Dan Ryan, between 1:56 am and 1:58 am. The schedule called for a train every 15 min.
Line
Red Line
Station
Sox-35th (station 40190)
Direction
toward 95th/Dan Ryan
Train before
run 938, passed 1:56:39 am
Train after
run 925, passed 1:58:39 am
Gap
2 min (120 s)
Scheduled gap
15 min
Collector
running the whole time
Scheduled against seen
Each tick is a train at Sox-35th toward 95th/Dan Ryan. 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 Sox-35th when its next stop moves past it.
Snapshot
Run 938 (before)
Run 925 (after)
1:55:09 am
next stop Sox-35th
next stop Cermak-Chinatown
1:56:09 am
next stop Sox-35th
next stop Sox-35th
1:57:09 am
next stop 47th (Red)
next stop Sox-35th
1:58:09 am
next stop 47th (Red)
next stop Sox-35th
1:59:09 am
next stop Garfield (Red)
next stop 47th (Red)
2:00:09 am
next stop Garfield (Red)
next stop 47th (Red)
Showing 6 of 6 snapshots in the gap. The full record, every train on the line minute by minute, is in 2026-10-10-red-bunch-93519.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.