<http://schema.org/description>
"We humans are mobile. Long before flight, FusionMan or even your average automobile arrived on the scene, trains were transporting us all over civilization. How did we get from horse-drawn carts to high-speed trains?"^^<http://www.w3.org/2001/XMLSchema#string>
<http://science.howstuffworks.com/transport/engines-equipment/train.htm>