Warren Buffet is investing in railways in US. Looks like he is convinced on the economy's rebound as well as the return of consumer buying in the US.
More importantly it seems that the he is convinced that US will see a rise in usage of railroad infrastructure over highways etc. That also indicates an interest in green infrastructure initiatives.
BNI also has presence in Asia which is continuing as the growth story across the world. The railway co.'s shares jumped a good 30% (from a P/E of 14 to almost 18).
Here is the LA Times story - http://www.latimes.com/business/la-fi-berkshire4-2009nov04,0,6604215.story
NY Times is also reporting that Buffet is paying a part of this deal in Berkshire stocks for tax purposes.