Find a grade crossing on that line. It should have a 7-character US DOT-AAR number (six numbers followed by one letter).
Then go to the FRA site for crossings here
and enter the crossing ID and select "Inventory". The site will give you a report and will give trains/day for that line on the bottom of the first page. I can't vouch for the accuracy of the count but it should give you some idea.
If you don't want to go out and look for crossings, you can use this FRA site here
and use the map. It shows the location and ID of crossings on each line. You're welcome.
edt: I'm showing 14 trains/day running up to 49 mph. Only 3 of those are daytime trains.
This post was edited on 5/4 at 11:20 am