Some time ago, at my main site, I posted a speedroll of a Hiawatha running Chicago to Milwaukee. There aren't any hills or curves of any consequence: there is a check for the flat crossing of the EJ&E at Rondout, for some curves at the Illinois-Wisconsin state line, and on the climb up the ridge that separates the Mississippi River basin from the Lake Michigan basin south of Milwaukee.

Because the passenger trains of the day were being converted to diesel, record-keeping and preservation did not rank high in the railroad's projects. There are stories of similar fast performances on the Midwest Hiawatha service particularly west of Hampshire, Illinois, but no documents have come to my attention.