Geez...I used to ride the metro all the time back in the late 70’s when I was in college. I thought it was great back then. Now when I sometimes take the train to a Nats game it seems to me that they’re still using the very same trains I rode on 35 years ago!
That’s because they are!
Why wouldn’t they be? Rail Car’s life expectancy is 50+ years.. you refurb the inside from time to time and rebuild the few mechanical systems on them, but they are very simple and heavy duty, they are supposed to last for 50 or more years.