Have you heard of KIS? Keep It Simple, thats the idea behind the DC Metro Map application.
* Full size map of the DC Metro system
* Pinch zoom, scroll left and right on the map
* Displays live real-time positions of trains (after map is left open for 15 sec)
* Tap any train on the map to see its destination
* Trip planner
No internet required for map.
Internet required for live train positions and trip planner.