A free program for Android, by Eric Schrag.
If you use the SEPTA Regional Rail system to get to work or to school, you can use this app to check when the next train is available between the stations you choose. You can also use it to see what train is coming next if you miss the previous one. It's a handy tool for commuters and people who need to know when the next train is available.
The app will also display when the trains are arriving at the station you're at. It's a quick way to see what's going on.
The app is free to download, but you will need to register to use it.