(03 Dec 2014, 9:30 am)Scott wrote Correct me if I am wrong, but the silver arrows are currently 2A and 2C, so why not change them to 2A and 2B.
The A stands for Anti Clockwise and the C stands for Clockwise as both Services operate a Loop around the Washington Area, I cant really see any reason to change it unless you want to confuse Passengers.