A fun way to pass the time while riding in a train is to do very quick sketches of the changing landscapes.
These are tiny watercolor sketches, only an inch and a half by ¾ of an inch, about the size of a postage stamp. Since the landscape disappears as quickly as it appears, you’re forced to form a mental image of the characteristic landscape.
As you transition from one region to the other you can easily see how the big planes of color gradually change.
Working quickly from a combination of observation and memory builds your skills for seeing stationary but complex scenes in simple terms. like this train station.