Some time ago, MRL changed its practice of putting Boeing loads right behind the power on KCKPAS or KCKSPO trains, and now cuts them in several cars back. Power on the KCKSPO which suffered the derailment was two BNSF units and one MRL SD45. The BNSFs pulled the head cars west to Paradise while the MRL unit was left behind for cleanup help. Other power was called to pull the derailed train's rear cars back to Missoula. Those two KCKSPO units were put into helper service the next morning, coming east out of Paradise and then cutting in mid-train on an eastbound manifest for the 2.2 percent on Evaro Hill. MRL helper power was used on subsequent tonnage trains. Those KCKSPO derailment units later came west over the hill leading another KCKSPO, which I suspect may have included some (if not all) of the cars they had been pulling when the Boeings went into the drink.