For what it's worth, I've been on the DC Metro. I can tell you for certain that almost nothing scares me, including heights. Those escalators scared me. If that's the only problem you have, I wouldn't worry. I just had to buck up and step on. Look straight down at your feet so you don't focus on the height.
For those who don't know, some of the escalators to get to the DC subway are hundreds of feet long. They're the longest escalators I've ever seen, and probably ever will see again. An elevator bank probably would have been a much better idea.
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