And Columbia Heights residents are a bunch of pessimists. The 14th Street North Metro escalators are once again working, after being out of service for about six days. Also, track work delays continue to plague the Green and Yellow lines this weekend. However, if you are on a train, hope for one with a speedy operator. The drivers of the trains I was on this afternoon were determined not to get stuck single-tracking and stopped for about 10 seconds less at affected stations.