Game is becoming more difficult. Progress is frustratingly slow because it takes very long to make some products (many things take more than 1.5 hrs) or grow crops (most take more than 2 hrs), for planes (5 hrs), ships (4-9 hrs) and trains (at least 3 hrs) to arrive. Buildings, houses and factories take at least 2 days to complete and if you don't have enough materials, it will take even longer as you have to wait for materials to slowly trickle in with the trains.