Galaxy Express is a rules set for a scifi board game that uses the Piecepack. It is freely web published and can be downloaded from the following address.

http://www.piecepack.org/Piecepackgames.asp

The theme is that you are controlling a spaceship(pawn) and have to move around the map (tiles) investigating planets(coins) to discover those to which you must deliver packages(coins). The difficulty comes through your limited choice of thrust(coins) and braking(coins). You can refuel but these are limited(dice).