At Argyle, toward Howard, between 1:23 am and 1:24 am. The schedule called for a train every 12 min.
Line
Red Line
Station
Argyle (station 41200)
Direction
toward Howard
Train before
run 942, passed 1:23:39 am
Train after
run 925, passed 1:24:59 am
Gap
1 min (80 s)
Scheduled gap
12 min
Collector
running the whole time
Scheduled against seen
Each tick is a train at Argyle toward Howard. 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 Argyle when its next stop moves past it.
Snapshot
Run 942 (before)
Run 925 (after)
1:22:09 am
next stop Lawrence
next stop Granville
1:23:09 am
next stop Argyle
next stop Thorndale
1:24:09 am
next stop Berwyn
next stop Wilson
1:25:09 am
next stop Berwyn
next stop Berwyn
1:26:09 am
next stop Bryn Mawr
next stop Argyle
Showing 5 of 5 snapshots in the gap. The full record, every train on the line minute by minute, is in 2026-10-10-red-bunch-91499.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.