It looks like the connection has been missed 17 of the last 70 days (going back to 7/1/14).
Some of the times are really, really close. Sometimes the CZ left less than 5 minutes before the LSL arrived - I've got to think that either there were *no* connecting passengers, or they're bussing them to close the gap. Look at 9/8, when the LSL arrived at 2:58, but the CZ left at 2:56. Weird.
Date LSL ARR CZ DEP Missed
7/1/14 2:33PM 3:12PM
7/3/14 1:49PM 2:19PM
7/4/14 1:13PM 2:43PM
7/5/14 12:26PM 2:08PM
7/6/14 2:24PM 2:41PM
7/7/14 1:35PM 2:06PM
7/8/14 3:03PM 2:02PM x
7/9/14 5:13PM 2:00PM x
7/10/14 11:45AM 3:05PM
7/11/14 1:43PM 2:11PM
7/12/14 12:45PM 2:33PM
7/13/14 1:11PM 3:36PM
7/14/14 1:11PM 4:48PM
7/15/14 1:03PM 2:02PM
7/16/14 4:47PM 2:45PM x
7/17/14 1:37PM 2:00PM
7/18/14 1:42PM 2:31PM
7/20/14 2:33PM 2:00PM x
7/21/14 11:38AM 2:56PM
7/22/14 12:21PM 2:13PM
7/23/14 1:02PM 2:11PM
7/24/14 1:16PM 2:35PM
7/25/14 12:26PM 2:14PM
7/26/14 12:32PM 2:00PM
7/27/14 2:00PM 2:16PM
7/28/14 12:00PM 2:00PM
7/29/14 2:34PM 2:30PM x
7/30/14 11:55AM 2:00PM
7/31/14 1:54PM 2:54PM
8/1/14 12:11PM 2:00PM
8/2/14 3:50PM 2:14PM x
8/3/14 2:29PM 2:00PM x
8/4/14 1:44PM 2:00PM
8/5/14 5:41PM 2:50PM x
8/6/14 2:34PM 2:12PM x
8/7/14 12:07PM 2:36PM
8/8/14 12:56PM 3:08PM
8/9/14 2:27PM 2:21PM x
8/10/14 11:21AM 2:00PM
8/11/14 2:28PM 5:11PM
8/12/14 1:23PM 2:17PM
8/13/14 11:50AM 2:55PM
8/14/14 2:17PM 2:00PM x
8/15/14 4:00PM 2:00PM x
8/16/14 2:03PM 2:52PM
8/17/14 2:19PM 2:00PM x
8/18/14 12:54PM 2:28PM
8/19/14 11:38AM 2:40PM
8/20/14 11:54AM 3:04PM
8/21/14 12:29PM 2:00PM
8/22/14 6:34PM 2:00PM x
8/23/14 2:47PM 3:03PM
8/24/14 2:43PM 2:50PM
8/25/14 2:05PM 3:39PM
8/26/14 1:33PM 2:00PM
8/27/14 10:39AM 3:06PM
8/28/14 1:03PM 2:02PM
8/29/14 2:32PM 2:29PM x
8/30/14 12:21PM 2:07PM
8/31/14 11:19AM 3:08PM
9/1/14 12:51PM 4:58PM
9/2/14 12:02PM 2:13PM
9/3/14 12:12PM 2:13PM
9/4/14 1:25PM 2:00PM
9/5/14 1:14PM 2:00PM
9/6/14 2:20PM 2:20PM x
9/7/14 1:25PM 2:03PM
9/8/14 2:58PM 2:56PM x
9/9/14 1:05PM 3:13PM
9/10/14 2:38PM 2:50PM Edit to add: Data available from John's Amtrak Status Maps site, accessed through Chris Juchins' awesome web interface:
http://juckins.net/amtrak_status/archive/html/history.php?train_num=5&station=CHI&date_start=07%2F01%2F2014&date_end=09%2F10%2F2014&sort=schDp&sort_dir=ASC&limit=&co=gt&limit_mins=
Super easy to copy and paste the data from both trains into Excel, make sure the dates line up and then run down the column and compare times. Thanks to you both for making these resources available.