"Railroads are a play on three big secular themes: the drive for increased energy efficiency, growth in coal and the agriculture boom," says Elliott Gue, a energy sector expert who has just returned from Japan where he was covering the G8 Summit.

Meanwhile, in his The Energy Srategist, he states, "Railroads are now among the most fuel-efficient forms of freight transport available." Here, he offers a bullish review of Union Pacific (NYSE: UNP).

"My long-held thesis on the group has been that the railroads are no longer totally dependent on the US economy for their growth.

"It's no longer appropriate to look at this sector as viciously economy sensitive. The traditional relationship between the broader market and the rails has been breaking down for several years, but this trend appears to be accelerating.

"In 2007, according to the Association of American Railroads (AAR), the average railroad moved a ton of freight a distance of 436 miles on a single gallon of diesel fuel. That makes freight trains roughly three to four times more fuel efficient than trucks.

"Union Pacific is the largest railroad in the US and has long been one of my favorites. The company's network is nearly 33,000 miles long and is concentrated in the West and Midwest. It also offers a convenient example of the bullish forces at work for the rails, particularly in the coal and agriculture industries.

"Even with the poor outlook for the economy, there are many investment opportunities being created by high energy prices and the low dollar," notes Jim Powell. In his Global Changes & Opportunities Report, he explains, "American 'rust belt companies' look especially good."

"Surprisingly, rising fuel prices are making some American manufacturers more competitive and I could not be happier about the improved outlook for many efficient U.S. producers.

"U.S. machine tool makers are starting to take back some of the business they lost to Japan 20 years ago. U.S. imports of Chinese steel are declining dramatically, while domestic production is rising at rates not seen in years.

"The list of U.S. businesses that are benefiting from the new trade relationships will lengthen, but it won't happen overnight. It's not just a matter of being loyal to the home team. America will benefit from creating more real wealth instead of the flim-flam financial products that led to the phony boom.

"Having spent a lot of time recently studying the North American transportation industry, my conclusion is that trucking is on the decline while the railroads are poised to increase market share," notes Tom Slee.

The contributing editor to Gordon Pape's Internet Wealth Builder states, "The logical conclusion: buy rail stocks now." Here he looks at Kansas City Southern (NYSE: KSU) and Burlington Northern Santa Fe (NYSE: BNI).

"Who would have thought it? Railways are having a good year. They were supposed to be hunkered down, riding out the recession. Instead, the old iron horse is thriving.

"Surging demand for commodities is more than offsetting a slump in building materials shipments. Even higher energy costs are proving a plus for the railroads. Each jump in oil prices gives them a bigger edge over their gas guzzling competitors: trucks.

"Most important, the rails are able to raise rates despite the economic downturn. Their surcharges are sticking. Yet the stocks are out of favour.