 New batteries could not be obtained, as batteries of this type were needed for submarines as part of the war effort.The vehicles were numbered 19A and 20A when supplied, but were renumbered as L8 and L9 in 1929, when the batteries were no longer fitted.As electric locomotives, they were upgraded several times, receiving two new types of motors in 1951 and 1955, and new traction control equipment in 1958.