In Yardmaster, 2-4 players compete to build trains comprised of railcars of different goods and values. However, players are restricted in connecting railcars of only the same value or good type, so if you grab a railcar you can't use, it needs to wait in your sorting yard until it can legitimately hook up to your train.
Players start with three cargo cards in hand, and three railcar cards are laid out on the table. Each player has one exchange token in one of the four colors, and whoever is to the right of the start player has a Yardmaster token. On a turn, a player takes two actions, repeating an action if desired; whoever holds the Yardmaster token takes a third action on her turn, then passes this token to the right.
Four cargo cards provide bonus actions during play, such as paying less for new railcars or drawing free cargo cards. The player to reach 16-20 points first wins.