A meet and a pass The Rio Grande Ski Train is westbound out of Rocky, Colorado, on the cloudy morning of June 28, 2008. It just met a Union Pacific coal empty at Rocky siding, and is about to make the long arc around Big 10 Curve. The train will then pass a BNSF westbound momentarily parked in Clay siding, waiting for the Grande gold and silver streamliner to pass. The DPU of the BNSF train is visible to the left of the tree.