Easy fan fiction answer - a large train car was filled with shipments of those flameless candles they sell (non-stop it seems) on QVC; a second car was full of batteries.....and the Terminus eternal flame memory room was born.
I hate to say that I don't think the show, especially the much touted "first six minutes" was as intense or scary as it was said to be. But I blame that on the pre-views. Even staying spoiler free, avoiding videos that let you see the first two or four minutes and such the regular commericals and pre-view just gave away too much. That Glen would survive because we saw him in what's obviously future forest scenes, that they'd all get out because of endless shots of Rick with his gun and the explosion plus some scenes in a church. This is the one show where you don't say well there's no suspense because they're not going to kill <insert lead actor/actress name>......they'll kill anyone so too much in the previews that are different locations takes something away.
But I won't say that means the episode was bad at all - it was awesome and fun and, my favorite, not dragged out with the group stuck in that boxcar for weeks on end. And, of course, the Daryl/Carol reunion is going to get major re-wind treatment for awhile. Even after when she was hugging Rick you realize Daryl's in the background crying, I don't think it's marry me let's have sex love, I can't really pin down what he sees her as, sister, mother figure or what - but I love their relationship anyway.