The VRE Rider app will show you the next trains that will arrive at your configured or closest stations, helping you know when you will need to be at there. It provides you with alerts from VRE and Twitter, and current train locations from VREs online information. The app also lets you browse the train schedules, see where stations are located, and get fare information.
No more fumbling with schedule cards or worrying if that meeting you are stuck in will make you miss the next train home, this is the essential app for anyone who rides the VRE trains.