For six months, researchers pointed the equipment—which includes a camera, an air sensor, a weather station, and an artificial intelligence processor—at railroad tracks transporting coal ...

Ralph Buchspics from Ashland works at the same mine ... tracks,” Buchspics said. But Ralph isn't mining coal like his grandfather, he's working with a patching trowel. He is building a new train ...

“The quirky lovechild of a bicycle and a train ... coal economy in this part of Weld and Boulder counties. Riders pass an old mine on the route. Rummer leases a 5-mile stretch of track ...