I used to take it too when I lived out in Merrifield...Dun Loring stop 15 years ago it starting to be a death trap then.
The train that derailed is my normal train, but I work from home on Fridays.
I tell visitors who come to DC to avoid the green line at all costs, or only use it in the immediate center of the city if you have to...never ride the green line out towards the extremities.