... At its peak, Cleveland hosted 90 regularly scheduled passenger trains a day, whereas Cincinnati had 125 and St. Louis 260. ...
Chicago also has few grade crossings, as it long ago passed an ordinance requiring all railroads within city limits to have grade-separated rights of way. Cleveland never passed such a law, but a number of railroad grade-separated their lines anyway. Most active in this regard was the Nickel Plate RR, which in 1915-16 completely grade separated its right of way through Cleveland. Also, many older industrial cities like Cleveland have (or had) belt-line railroads, but ours was built to mainline quality standards. Many other belt-line railroads are (were) for industrial access and thus had lots of grade crossings and were fairly low-speed operations.
your comments about Cleveland's relative lack of historic passenger rail traffic is interesting. I guess the Vans were groundbreaking (no pun intended) in putting their rail terminal at the center of business district underground while developing air rights overhead. New York's the only other city I've seen do this. Most passenger terminals are at the periphery of their downtowns, some (Cincy, Baltimore, Detroit) weren't/aren't downtown at all.