One of the major reasons Washington DC was on my list of acceptable places to live, is it has a good public transit system, specifically a subway system. The DC system has a few flaws, they have no schedule, if you ask about a schedule they will tell you their target time for frequency of trains, but they have no schedule and no real idea when any train will arrive or depart any station in the system! It is two track system, with no real bypasses, so if something stops the flow of traffic on a rail line, things go all kinds of wrong. Some of the staff are surely, some angry, uncaring, - enough of them to staff to give the staff a bad image. Actually many of them are delightful, caring, kind, I have had them hold the train and re-open the doors as I was emerging from an escalator onto the platform at the airport late at night.
When I travel, if there is a subway or train system, I try to use it. The photos above are from New York City in August. NYC has an old system, most of it is shallow created with cut and cover. There are some deep sections, my great grandfather work on building some of those. Many of the stations are dirty and grim. They are not just old, they are ugly. Because of the age and the shallowness much of the system has only stairs to access the platforms, and if you enter on the wrong side, you likely have to go back to street level, cross the street and reenter the system to get to the other platform (in all of the DC stations you can change directions or platforms without exiting the station.) The interior of the cars in New York are designed to hold the maximum number of people, in the minimum level of comfort. Hard plastic seating down both sides, lots of standing space. The DC system has a lot more seating and the seating is much more comfortable. The original DC cars had deeply padded leather seating and carpeted floors.
The Photos below are of the DC system. Come visit, I have an extra metro card you can borrow.