Ore trains across BNSF's Pacific Northwest route?

[CN5789]

I noticed a picture in my Trains mag of a BNSF ore train (possibly just empty cars or a cut of them in a manifest freight) emerging from Cascade Tunnel with what looks like ore cars used for carrying iron ore concentrate. the cars actually look very similar too the ore cars used by the Wabush Lake Railway which hauls iron ore in Quebec. The cars are black with RMGX reporting marks.