The only times that I have gotten the winter respiratory illnesses as an adult are when I traveled by plane in winter during the holiday season. I have yet to take the train during the holiday season or any time in winter and was wondering what people's experiences have been in this regard. I have attributed getting sick after air travel from being crammed in with multitudes of people in a narrow tube. Because the train is more spacious, maybe the extra distance between people and the walls would decrease the chance of catching the flu or the like. Comments, experiences...?