Example: the large growth in freight traffic over the UP West line over the last twenty years. Result? overcrowded at times, thus delays.
I don't know about other lines, but most of the delays on Southwest Service (ex-WAB) are the result of cross traffic at Belt Junction (BRC), Forest Hill (CSX) and Chicago Ridge (IHB).
https://www.chicagobusiness.com/greg-hinz-politics/feds-want-figure-out-why-your-metra-ride-keeps-getting-delayed
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