A-Train

Mild cheat:
The game's annual income tax rate is 50 percent, but property tax is a mere 5 percent. So before April 1 assessment day, spend your cash on buildings. Those cash outlays count as expenses against your income, letting you report tax-free negative income even while generating revenue from the property.

Mega cheat :
To get $1 million plus all the supplies that you can store, hold [Ctrl] and [Shift] and type: cheater-cheaterwimp.

Funny cheat :
Press and hold [Ctrl] and [Alt], then type :
bellybutton
The ending screen will be .... uh ... different. (Information from Cheat Machine)