Yes, yet another American who isn't quite getting the 2-4-1 travelcard thing, even though I've read the articles. From what I understand, it will be clearer when we get there, but I have a couple of questions. Do I need to print the vouchers out at home, or will we be able to get a booklet at the station (I think I read that someone was able to get one there). Also, do we need to bring the 2x3 photos from home, or can they take photos there? And, lastly, if I'm staying in Chelsea, where is the nearest rail station where I'll be able to purchase the paper travelcard?