In the 20th century rail travel languished as Americans fell in love with cars and interstate highways.

ECONOMIST: America��s trains may soon go faster��relatively

Though the state's transportation authorities strongly advised citizens not to drive, some interstate highways in Oklahoma were jammed with stalled traffic, as heavy rains drenched roadways and flooded low-lying areas.

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The fun has already started in parts of Kansas and Nebraska, with the snowstorm expected to roll over the Great Plains between interstate highways 70 and 80, according to CNN meteorologist Karen Maginnis.

CNN: Spring snowstorm rocks Rockies, menaces Midwest