According to this video, (this one has only one coach behind the EOG)
click here , the last coach is a Self-generating ICF A/C chair car coach.
Looks like some of the A/C CC coaches being used for this train are out for repair and the depot does not have an EOG A/C coaches left, so they are using normal SG coaches instead. Since the SG coaches cannot be coupled between the EOG coaches, they have been coupled at one end of the rake.