Short:  Play the role of a city planner
Author: Mark A Thomas and David P Townsend 
Source: Fish collection

In METRO, you play the role of a city planner.  Using limited funds, you
must construct a mass-transit subway system capable of meeting the needs of
your city.  Build wisely and your system will be a success, but poor
planning will lead to disaster and financial ruin.  Source available from
author.  
.
