I suppose they are using a modified 2824 on the night train and call it Ball Cal. 124. Jeremy once mentioned that all Ball Caliber starts with Top grade movement. I wonder if it also applies to the night train? Given the price point for the night train I'm not sure it contains a Top grade 2824.
I know somebody will starting bashing on the myth of movement grade. But I'm convinced that a Glucydur balance and Anachron hairspring plus better adjustment on a top grade movement does make a difference in accuracy.