After 15+ years in Washington, D.C., and regularly "swiping" my Metro card, I was surprised to "dip" it in Chicago. Not only do the official (posted) instructions advise train passengers to "dip" their cards, but a Station Manager reinforced the term when I asked him for help, as did this Chicago Tribune article.
To my delight, my opportunities to use the word "dip" have expanded! There's now more to "dip" than my toe in a swimming pool or a soft-serve ice cream cone into warm chocolate.
I wonder if there's a linguist doing field research in train stations across the U.S. -- preparing to design a "dip vs. swipe" map similar to this "pop vs. soda" map? (Or maybe "swipe" is a D.C. Metro thing?)