One HO scale Air Conditioner/Heater unit manufactured by EKYRAIL used on some BNSF locomotives, including BNSF 2102 and BNSF 2105. These former St. Louis - San Francisco locomotives were not originally equipped with air conditioning and have only recently been fitted with these units on the engineer's side just ahead of the cab. The location of this unit requires relocation of the hand hold on the side of the nose to a ladder configuration on the engineer's side nose front.
The three parts for this unit are intended to be assembled using the tabs and slots on the back as a guide. The large grille faces forward, the side with four grilles faces outward from the side and the treadplate faces upward.