By 
Mind the Gap, courtesy of Jonathtan
If you want perspective on the DC Metro system, sometimes it’s valuable to look at another light rail system somewhere else. And nothing signifies subways more than the London Tube. (All New York City fans can feel free to argue this in the comments section.)
The first thing to realize is that DC and the Tube are, in many ways, very much alike. If you have ever used the Metro, you will be right at home with the Tube ticket vending machines and the entry gates. And there are just as many escalators in a Tube station as there are in most Metro stations. Even the platforms look a lot alike, with the textured area right next to the trains to warn the blind of the dangerous area ahead.
There are some great comparisons, and lessons that I think both sides could learn…