Card Rails Exchange Rules Overview

About Card Rails Exchange, from BoardGameGeek:

Card Rails: Exchange is all auctions all of the time! Players blind bid to win railways in which they can invest so that maybe they can win big in the end - but sometimes losing a bid can be a better long-term investment. It depends on what's in your hand! This game is about trying to balance the bid you're making with the cards in your hand because you earn points based on the number of completed railway cards and which investment cards you used to complete them. Whoever ends up with the most points wins. Card Rails Exchange is a standalone game in the Card Rails line. -description from the designer