Train Whistle! Although I wish the pitch of the whistle was a little bit higher, still it's a free train whistle on your phone. What could be better? Recommend!

TuTu Train - Kids Lite This is a really neat app for kids who love trains. It's simple. Navigate the course and move forward or backwards. Also, I looooooooooove the sound of the whistle! Highly Recommend!

Build A Train Lite This app is like having your very own old-fashioned train set on your iPhone. I imagine there is an iPad version that is more fun to play simply because the screen is bigger. However, I love this app. Turn the tracks on and off, control the speed of the train and ring the bell! Awesome!