According to numbers from Canadian National and Amtrak, train traffic is the following:
Elm Street to McCamly Street, CN line -- 25 freight, 8 Amtrak, 3 Norfolk Southern
Michigan Avenue, CN crossing -- 25 freight, 2 Amtrak
Kendall Street, CN crossing -- 25 freight
Kendall Street, Michigan line crossing -- 8 Amtrak, 3 NS
As an example:
Taking the total number of trains from Elm to McCamly, 36, multiplied by the number of horn blasts required by the federal Train Horn Rule -- two long, one short, one long (four) -- there are currently 864 horn blasts per day in this section. There are six crossings from Elm to McCamly.