Poliwag is right, just because your wifi is strong and fast doesn't mean two people is faster than one in this game. If you keep having two ppl coming to your town, your going to deal with delays of saving like a nut job, it's better to have one person do it. And that one person must also have decent or good net to constantly come to ur town with long saves or delays. Trust me, I've completed many train upgrade threads. I can even get people to vouch for my statement.