 Three Class 64 electric multiple units ( EMU ) were delivered from Strømmens Værksted in 1934 . Only 16 metres ( 52 ft ) long , they were the smallest EMUs ever operated by NSB . In addition , four passenger cars were delivered , with each multiple unit able to haul two passenger cars . Occasionally , Class 64 trains were used on the Flåm Line , after it was electrified in 1944 , and El 9 @-@ hauled trains from the Flåm Line used on the Hardanger Line . 
