1890 Berlin offers some intriguing twists to Age of Steam. The early game is a fight over real estate with Engineer being popular, while the mid-to-late game is more about controlling cube shipments with First Move and Production being popular.
The cities are always replenished to 4 cubes during goods growth (there's no shortage of cubes here) but you can only ship cubes out of a city in order, from right to left. You have to watch how cubes move - do you ship that cube for 4, leaving a 6-link delivery open for an opponent?
The Moon is a brutally tight Age of Steam expansion, especially when using the original 1-cube per city starting rules. Limited building options, expensive terrain, route-sharing and different actions are powerful especially Urbanization and Low Gravitation. I'm not fond of the wrap-around map as I have a hard time visualizing my routes.