from the sponsor site:

Count down the days until Christmas with Lionel! You may win a special gift to put under your tree!

Christmas day will soon be here! To help you count down the days until Christmas, we will be sending out a special email each day from December 1st until Christmas day.

Once you register, you will automatically be entered in our special Holiday Sweepstakes to win one of four weekly prizes

Enter Lionel's 25 Days of Christmas Sweepstakes for your chance to win one of four Lionel Ready-to-Run O-Gauge Electric Train Sets:
Lionel 25 Days of Christmas Sweepstakes