I have noticed that there were no on duty times for NS trains on the Wiki, but I just found one source for approximate on duty times. Cutoff and available times are listed, so I went with one hour after cutoff for on duty times.
http://www.nscorp.com/content/nscorp/en ... dules.html
I have added on duty times for 20N and 21N. Did I get the approximate times correct?
http://railroadfan.com/wiki/index.php/N ... Intermodal (scroll to 20N and to 21N)
Obviously it's just intermodal train on duty times, there is currently no on duty time sources for other NS train types that I've come across. As of now, focus is on NS trains originating and terminating within Michigan.
Anything pertaining to railfanning in Michigan.