Level select:
Quickly press [Up] [Left] [Right] [Down] [Left] [Up] [Down] [Left] [Right] at the title screen. The sound of trains will confirm correct code entry. 

Cheat mode:
Quickly press [Up] [Left] [Right] [Down] [Left] when the Plastic Reality Technologies logo appears. The sound of trains will confirm correct code entry. Enter one of the following passwords to activate the corresponding cheat function.

Effect
 Code
 
All trains in editor
 moretrains 
 
All cars in editor
 morewagons 
 
Debug mode
 imgoingnow 
 
Mini trains
 minitrains 
 
Mini cars
 miniwagons 
 
Alternate music
 listentoit 
 
Alternate sound effects
 itsnoisily 
 
View system statistics
 commotions 
 
Zoo Tycoon demo
 thanksforme