It's so strange when people tell you how something is obviously impossible to have that has existed for their entire lives.
Maybe they think that trains are like planes, and that you have to stay on them for the entire Chicago-LA trip, rather than getting off (or on) at one of the 50 other stops?
Maybe they think that trains are like planes, and that you have to stay on them for the entire Chicago-LA trip, rather than getting off (or on) at one of the 50 other stops?