They disappear into the kitchen car for a moment, and then beyond that into the storage car, and come trotting back a couple minutes later with a plate of triscuit-type crackers, some slices of swiss cheese, and a sliced-up avocado minus the pit.

"Here we go. Layer these up. Cracker, fruit, cheese. See how the textures do for you," they say, setting the plate next to the omelet.