This video is part of our "Motley Fool Conversations" series, in which consumer-goods editor and analyst Austin Smith discusses topics around the investing world.

In today's edition, Austin talks about one of the surprising losers of cheap natural gas, and that's railroads. Cheap natural gas prices suppress the demand for coal, one of the railroad sector's biggest divisions. Coupled with a mild winter, we see CSX (NYSE: CSX) realizing a 3% decline in coal shipments. 

Austin thinks the effect from cheap natural gas is a bit larger than that. though, as CSX also saw a 15% jump in metals, of which coal is a major input. So increased metal production could counterbalance, to some extent, cheap natural gas prices and a mild winter. 

This isn't to say that cheap natural gas makes railroads a bad bet, though. In fact many rail companies are seeing great quarters, with retail sales growing, oil above $100 a barrel, and vehicle sales rising. What it does mean, though, is that railroads should expect to be less dependent on coal shipments for at least the next few years. Should retail sales retract, metal production wane, or oil fall below $100 a barrel, cheap natural gas would have a more significant impact.

Natural gas is cheap today, but it may not be forever. Big swings in energy prices makes it tough to nail winners in this space, but when you do, the cash pours in. Fortunately for investors, The Motley Fool has identified one energy stock that's positioned to deliver great returns for years to come. You can learn more in our special free report, "The Only Energy Stock You'll Ever Need." Don't miss out on this limited-time offer and your opportunity to discover this under-the-radar company before the market does. Click here to access your report -- it's totally free.