Earlier quoted context omitted.
Natural gas is an alternative to oil for long distance transportation, although both are still fossil fuels. Progress is being made on algae biofuels. If electricity gets cheap enough it can be used to make synthetic hydrocarbon liquid fuels.
But again, if electricity is cheap enough, why not electric trains like we do in Europe? Or hydrogen if you need some energy storage on board? See http://www.imeche.org/news/news-article/could-hydrogen-train... I bet that this would be much better for the environment than algae.
http://www.caltrain.com/projectsplans/CaltrainModernization/...
Hydrogen is probably a dead end. It's too bulky, hard to handle, and the energy efficiency is terrible. Most hydrogen fuel today is produced from natural gas, which is just stupid.