Cheat Codes:

Press 'F1' followed by alot of '$', and you will become very rich.

$500,000:
Press [Shift] + 4 at the top layer of maps. 

$3 million:
Press [Shift] + 4 + [F1]. Note: This code may only be enabled once per game. 

Access to All Denied Terriotories 
Press TAB to bring up cursor, and type in Let me in to give access to all denied territories. 

All engines become AMD 103s at Expense of Profit 
Press TAB to bring up cursor, and type in AMD103 to convert all engines to AMD103s 

Doubles Maximum Train Speed 
Press TAB to bring up cursor, and type in Speed Racer to double the max train speed. 

Give all engines 
Press TAB to bring up cursor, and type in Show me the trains to give all engines. 

Give Character $1 million 
Press TAB to bring up cursor, and type in Slush fund to give your company $1 million 

Give Character $100 million 
Press TAB to bring up cursor, and type in Powerball to give your company $100 million 

Give Character $100,000 
Press TAB to bring up cursor, and type in King of the hill to give your character $100,000. 

Increase City Size 
Press TAB to bring up cursor, and type in Viagra to increase city sizes. 

Lose Scenario 
Press TAB to bring up cursor, and type in BoBo to lose the scenario. 

Win with Bronze Victory 
Press TAB to bring up cursor, and type in BigfootBronze to win with bronze victory. 

Win with Gold Victory 
Press TAB to bring up cursor, and type in Bigfootgold to win with gold victory. 

Win with SilverVictory 
Press TAB to bring up cursor, and type in BigfootSilver to win with gold victory.