At the link http://www.copwatch.zinelibrary.info/DOGO.JPG (and a little later, here) you will find a graphic of downtown Olympia.

There, in the graphic, are little white and red intersections. Red means trains, and Federal involvement. White means City of Olympia and local police involvement (if one is blocking these intersections).
It's your choice how you will treat pieces which land in either kind of intersection when the police surround them.

The hardest part of the game are the rules:
YOU write the rules. (It's harder than you think)
I only ask that you be realistic about how pieces move, where pieces "land" and how fast they can really move from place to place. If you actually use the rules of "go" you can just place the pieces down, never moving any of them, and every few turns see if a "Train" or "Convoy" of military vehicles can get into, or out of, the Port of Olympia (at the top) to one of six exits, marked in red along the bottom and sides.

Or, if you want to you can assume they are coming inbound from the exits, toward the Port.

Most important rule: HAVE FUN AND PLAY!