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: Alice, have you transferred the funds to the Anderson account yet?
Woman: No, I haven’t done that yet. I’ve been working on the Morrison and the Anderson’s account this week.
Man: Good, there are a few changes we need to make.
Woman: Really? It’s good I haven’t had a chance to go to the bank yet. What has been changed?