Errata:

Two-Player rules for Northern Pacific

All of the regular rules apply with these exceptions:

Set aside a set of unused cubes in one color to be used as the neutral player.  When locomotives connect to cities with neutral cubes, neutral cubes from that city are simply returned to the neutral player’s supply and are not scored.  Players’ cubes in a city with neutral cubes are scored normally, or counted as bad investments as normal if not scored.

The maximum number of cubes total (player or neutral player) that can be in a city is 2. 

At the end of each player’s turn, after they have either placed one of their investment cubes in a city or placed a locomotive, they must take an additional action.  The additional action will be either:

A) If the end of the track is currently exactly one locomotive away from a city with a neutral cube that the track can still legally connect to, the player must add a locomotive to the track to connect to the city with the neutral cube.  If there are multiple cities with neutral cubes that are one track away after a player has taken their standard action, the active player chooses which city with a neutral cube that the track connects to. Any neutral cubes in the newly connected city are returned to the neutral player supply.  Any player cubes in the newly reached city are scored normally.

B) If at the end of a player’s turn, the end of the track is not exactly one locomotive away from a city with a neutral cube that the track can still legally connect to, then the player must add a neutral cube to a city that the track could still legally reach. The player may not add a neutral cube to a city that the player added one of their own cubes to in this same turn.

At the end of a round, remaining player cubes are removed and scored as normal.  Neutral player cubes are simply returned to the neutral player supply.

If at any time during a round additional neutral player cubes are needed, simply use cubes from another unused color.