Instructions
Launch "Chris Sawyer's Locomotion" by clicking its shortcut in the Start menu. Start a new game or load an existing one.
Locate the performance index at the lower left of the screen, expressed as a percentage. Next to it, an arrow tells you whether the index is on an upward or downward trend.
Raise your performance index by increasing your railway company's efficiency. To do so, focus on routes in which demand is high, and choose locomotives that are cheap to maintain.