At Jarvis, toward 95th/Dan Ryan, between 12:40 am and 1:18 am. The schedule called for a train every 15 min.
Line
Red Line
Station
Jarvis (station 41190)
Direction
toward 95th/Dan Ryan
Train before
run 923, passed 12:40:24 am
Train after
run 938, passed 1:18:24 am
Gap
38 min (2280 s)
Scheduled gap
15 min
Collector
running the whole time
Scheduled against seen
Each tick is a train at Jarvis toward 95th/Dan Ryan. The two runs either side of the gap are labeled.
What Train Tracker said
Train Tracker reports each train's next stop. A train has passed Jarvis when its next stop moves past it.
Snapshot
Run 923 (before)
Run 938 (after)
12:39:09 am
not in service yet
next stop Morse
12:42:09 am
next stop Morse
next stop Howard
12:45:09 am
next stop Granville
not in the feed
12:48:09 am
next stop Bryn Mawr
not in the feed
12:51:09 am
next stop Lawrence
not in the feed
12:54:09 am
next stop Sheridan
not in the feed
12:57:09 am
next stop Addison (Red)
not in the feed
1:00:09 am
next stop Fullerton
not in the feed
1:03:09 am
next stop North/Clybourn
not in the feed
1:06:09 am
next stop Clark/Division
not in the feed
1:09:09 am
next stop Chicago (Red)
not in the feed
1:12:09 am
next stop Lake (Subway)
not in the feed
1:15:09 am
next stop Harrison
not in the feed
1:18:09 am
next stop Cermak-Chinatown
not in the feed
Showing 14 of 42 snapshots in the gap. The full record, every train on the line minute by minute, is in 2026-10-10-red-gap-91104.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.