Here are three great Android apps to enjoy. The official Amtrak Android app has arrived at the station and is waiting to depart. You can book tickets through the app or keep up on arrival times. Sierra Trading Post also emerged on Google Play as a great way to shop for brand name clothing at huge discounts. Last but not least, our game today is Project Downforce, a very retro grand prix racer right down to its sprite-based graphics and chip tune soundtrack.