Why does the woman prefer sea transportation?

Man: From what I’ve heard, you’re already well up in shipping work. How do you like the goods dispatched, by railway or by sea?
Woman: By sea, please. Because of the high cost of railway transportation, we prefer sea transportation.
Man: That’s what we think.

Man: Linda, do you know how to get to Daniels Co. ? I’ve never been there before.
Woman: Are you driving or taking the subway?
Man: The subway.
Woman: Right. Take the No. 9 bus from West 72nd street. Get off at Times Square and change to the shuttle. Go across town and get off at Grand Central station. Go above ground and walk north on Park Avenue.