NYC Transit is having fun with Twitter, and today started a new, interactive feature, "What Up Wednesdays." They're soliciting "Questions about the subway system? We're here to answer up to 5/day. Play nice, please." So what is up today? "The longest subway line w/o changing trains is the A - 31 miles from 207th St in Manhattan to Far Rockaway in Qns." Also, "The numbers pop up on some turnstiles after recent maintenance. The # has to do with maintenance codes, not your MetroCard." That's cool, but can they tell us when we'll finally be able to transfer to the uptown 6 train at Broadway-Lafayette without going above ground? So annoying.