7 billion is what it would cost to make the Chicago area transit system equal to what cities in Europe, Japan, Taiwan, and now even China similar in population to Chicago have now.
240 million is what the CTA needs to keep its system moderately equivalent to what you may find in developing countries such as Brazil and South Africa.
7 billion is a fraction of what the government spends on highways. Sadly, it is a fraction of the 80 billion or so a year the U.S. has been spending to install an Iran freindly Shi'a dominated government in Iraq.
Guess we all need our priorities....