I haven't taken the train from Philly to AC before, but I am very familiar with AC itself. The area that teh train staion is in, while it formerly was shady, is actually a decent part of town now. There is a large outdoor mall that runs from teh convention center to the casinos. It is packed with all sorts of normal people during the day, and even at night there are quite a few nice restaurants in the complex that keep it from being desolate. Perfectly safe to walk and a sign that AC is (finally) being cleaned up quite a bit.