Railroad Tycoon

Go to the Regional Display and press Shift+4. 
It gives you $500,000. Don't use it after you 
reach $30,000,000 or you will start LOSING $500,000.

Extra Income:
Begin the game and click on the icon to make a tunnel, 
then you hold the SHIFT button pressed while you click 
in on the wall with water. After that you will see the 
following phase one time: estymated income 3.000.000.000! Note: 
This will only work one time