The railcars, class Bhe 2/4, are painted in a red livery for operation on the Vitznau section. Numbered 1 - 3 (incl) they were products of SLM / BBC, and introduced with the electrification of the line in 1937. Because the three railcars weren't enough to completely replace the slower steam trains a fourth railcar of the same series as the first three was bought in 1953. It received a bigger cargo hold and was classified as BDhe 2/4 and got the number 4.