DeckEleven's Railroads 

DeckEleven's Railroads is an entertaining strategy game developed for Mac users that can keep you in front of your computer for hours with its exciting challenges. Your objective is to complete various tasks that include cargo or passengers deliveries, building train routes, and many others.

At the beginning of the first couple of missions you will receive several gameplay instructions. You can always skip these hints whenever you like by clicking outside the instruction window.

Personally, I really enjoyed playing this strategy game mostly because it offered nice challenging levels with assignments being different from one mission to another. What's more, the app automatically saved my gameplay progress every time I completed a challenge.

Another thing I like about DeckEleven's Railroads is that it doesn't give you access to all missions from start. By completing a level you unlock the next one and so on.

My only concern regarding this game is the fact that it doesn't provide you with an option to increase or decrease the gameplay speed. Other games from the same category offer you this feature, which comes in handy when you need to deliver many items or the distance between station is big.

All in all, DeckEleven's Railroads is a fun and addictive game, suitable for users of all ages. And since you don't have to pay to use it, I can't find any reasons why you shouldn't try it on your Mac.