BHP iron ore trains cross at Jimblebar Junction, just north of Newman. It is likely these two trains began/destined for Jimblebar minesite, some 6km to the far left of this image.
The parade of empty ore trains continue as a pair of SD70ACes upfront (and two more mid train) whine through with dynamic braking holding this empty train to track speed.
BHP Billiton SD70ACe's 4385 & 4416 lead a loaded iron ore train bound for Port Hedland with DPU units 4306 & 4351 just coming into sight in the distance halfway down the train.