This article on subway ettiquette has this little gem in it.
This is the paradox of daily life in the capital of the free world, where every second counts. The people who live and work here take themselves seriously, striding purposefully with their written testimony, task force recommendations and briefing books.
And may I say, too seriously. Plus, if you’re cutting it so close that walking up or down the escalators matters, try padding your schedule a little. Or move to Idaho, no subway, no buses, no public transportation at all.