Hey, Penelope lady, take notes.
Via Steve Annear.
Looks like a corn snake, my personal favorite of the common pet snakes. Basic wild-type coloration is lovely, and breeders have created a wide variety of wonderful color and pattern morphs. They're not finicky eaters, don't get very big, and aren't aggressive.
Although proper proper technique for transporting it on the subway (at least what either of my snake-handling parents would have done) would be to put it in a pillowcase securely knotted at the open end.