Your looking at power car WAB 133, a class BDhe4/8, which went into service in 1988. Power cars are located on the downgrade side of all trains, one would guess as a precaution, so this is the tail-end of a train in Lauterbannen station ready to depart upgrade to Wengen and Kleine Scheidegg. After reaching Kleine Scheidegg WAB 133 will return here leading the train.