Have you heard of KIS? Keep It Simple, that's the idea behind the DC Metro Map application.

Features:
* 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.

Added button to show/hide live trains
Live trains displayed in line color
iPhone 6 and iPhone 6 Plus compatibility