BNSF protect locos on #3 & #4

Heard BNSF AC units being added to these trains while traversing the blizzard area. Anyone heard any more ?. Maybe a P-40 DC has grounded out traction motors ? Wonder if # 5 & 6 will get same treatment. Maybe learned lesson from last winter ?

BNSF 6621 ( ES-44C4 ) leading #4 / 19th