Well, now that I think about it.. I guess you do see most of the train cards your opponents pick up. But it sure would be a chore in memorization. Seems that would increase the incentive for blind draws over the open cards.
Actually, this might make it a better variant for TTR Marklin, since you normally draw a lot more face-up in Marklin. Normally, I find the $%*&@ passenger cards penalize face-down draws.