Unfortunately, Amtrak has cut bicycle capacity on Hiawatha Service. But bike-friendly Venture cars are coming. - Streetsblog Chicago

I booked with a bicycle on Hiawatha last weekend and Amtrak called me two hours before departure to tell me that they were cancelling the bicycle reservation. When I went down to MKE intermodal to see what they could do for me, they told me they'd honor the reservation. :)