In a statement on its site, Amtrak announced that now through Aug. 28, kids aged 2 to 12 can ride free (with each paying adult) on Amtrak's Milwaukee-to-Chicago route, the Hiawatha line. Up to two children can ride free, and travel must be on Fridays, Saturdays and Sundays, with blackout days on May 27 and 30, and July 1 and 4.