I still wonder if the food might have been drugged. If the Terminus folks let people keep their weapons, then that would make them feel more comfortable and let their guard down. If the food they offer to the newcomers is drugged, then they can capture the newcomers without a fight. The “A” path where they herded them to the train car might be the backup plan for anyone who doesn’t eat the drugged food.
I agree with the food being drugged. Now, how come the big guy (forget his name) and Glenn, or all of them for that matter, didn’t come charging out of the rail car when Rick opened it?