"I know the engine pulling us--" flip flip flip to the draft of the black steam engine, picture perfect, "--is a 4-4-0 locomotive that shouldn't be able to drag any consist through the void of space-time, but she's pulling twenty-six cars at a speed that should have rattled her to pieces hours ago. I want to find out how that's possible."

Tony flips back to his current work, and finds himself adding one of the plushes to the top bunk of the sketch, with a few short strokes of his pencil. It's none of her business that 'why' is really boiling down to 'because it will make this experience entirely less terrifying if I can explain it in grounded, perfectly normal terms'.