The infrastructure assets are recorded and analyzed based on a number of characteristics, such as:

The index ranks the combined infrastructure assets in the hands of the biggest public and private organisations in the world.

Amtrak, heavily subsidized by taxpayers, maintains over $17 billion dollars worth of infrastructure assets throughout its national rail passenger system.

It is now a deal powerhouse; in 2004 and 2005, it bought $17 billion worth of global infrastructure assets, according to Thomson Financial.

"When prices rise, infrastructure assets tend to be able to increase prices in concert," he said.

Infrastructure debt is the fixed income component of infrastructure assets.

Asset management attempts to fill in the gaps of such fragmentation for better performance in infrastructure assets.

It also controls a large number of subsidiaries, including key infrastructure assets.

The nature of Cintra's business has been to create value through effective management of its infrastructure assets.

The weighted average lifespan of its infrastructure assets is reported to be close to 75 years.