A single tanker car carrying 25,000 gallons of asphalt product derailed and tipped onto its side Friday morning in a Vancouver rail yard, according to BNSF Railway.None of the contents of the car spilled, and there were no injuries, said BNSF spokesman Gus Melonas. The derailment happened during a routine switching operation, he said, but the cause was not immediately known. The incident remains under investigation.The derailment occurred in an area of the rail yard just north of West Fourth Plain Boulevard in Vancouver. The overturned car and maintenance crews were visible from the Fourth Plain overpass over the tracks.“BNSF personnel responded within 10 minutes of the incident occurring,” Melonas said.The load of asphalt was on its way from Canada to Portland’s Linnton district, Melonas said. Additional crews expected to have the car hoisted back on the tracks Friday afternoon. The load of asphalt would likely be transferred to trucks, he said.