After planning that you are going to Chicago by train, you need to book the train at required time, the Amtrak provides more facilities to book the tickets, check the following link to book the tickets:

http://www.amtrak.com/servlet/ContentServer?c=Page&pagename=am/Layout&cid=1237437856311

Before booking tickets, you need to know about the seat availability, to know about the availability use the forms in the following link:

http://www.amtrak.com/servlet/ContentServer?c=Page&pagename=am/Page/HomePage&p=1237405732502&cid=1237405732502

Chicago is considered as one of the most adventurous place in world with all type of live entertainment, excellent weather conditions. Visiting Chicago from either Australia or new Zealand can be very affective and safe if traveled by air.

Though many other travel options can be considered in addition to air travel for example by sea or by land. Traveling by Air is always considered as the safest, time saving and the best of all the modes to reach Chicago from Australia or New Zealand.

Important deciding factors are budget and time restrictions which can definitely help you in deciding your travel mode.

http://www.oneworld.com