Brady went poopy on the potty

Finally, in about 2-3 weeks, Brady went poopy on the potty. He was so excited to tell me when I got home today, so we immediately went to the store to get his train. We have been telling him every time he would go in his underwear that he wasn't going to get his train until he went on the potty. He did actually go a couple other times on the potty, but it was always when it was their bedtime, so it was too late to go to the store. This time he did it early enough, the we immediately went when I got home. I told him that he had to keep going on the potty, otherwise it would get taken away again. So far, so good. If he goes on the potty for a week, then we will all go bowling as his final reward.