I claim to have invented the use of abandoned railroad grades as bike trails years ago, although numerous other South Side kids also used the former Lakeside Belt Line and Muskego Lakes branch for such purposes. In our old age, we get to see those rights-of-way being made less rough on bicycles. The latest addition to the network will use an abandoned section of the old Chicago and North Western passenger main from Hampton Avenue to Wiscona Junction, where it will connect with the old Milwaukee Northern to Ozaukee County and the existing Interurban Trail.
There are several other bike trails pieced together out of abandoned Milwaukee Road and Chicago and North Western trackage in the Milwaukee area, but, as of yet, no full connectivity among all those pieces, without the use of city streets. One such trail appears to offer rail enthusiasts an opportunity to observe Amtrak and Canadian Pacific traffic without interference from railroad security.