As per info by shuhaib, this was not planned allotment. Since that day ICE had loco failure, and as per LSA, loco which ERS-CAN ICE was bringing was supposed to go with CAN-CHV Passenger. Because of failure, it was decided to give loco of CAN-ERS ICE to CHV Passenger on safer side and give eloco which came with btpn to CAN-ERS ICE.