By OnMilwaukee Staff Writers   Published May 05, 2011 at 8:18 AM

Looking for an inexpensive day trip with the kids? Amtrak might have you covered.

In conjunction with the national rail carrier's 40th anniversary, children 15 and under can ride the train for free until June 9 (one free children's ticket per each adult ticket purchased).

Tickets must be purchased by May 6. You can get yours online at amtrak.com and using promotion code H859.

If you head to Chicago Saturday, your little ones might enjoy National Train Day festivities at Union Station. There will be train equipment on display, live entertainment, equipment demonstrations, model trains and much, much more.