 Although the railcars are capable of working as single units they are normally to be found working with the trailers.On the Arth section class BDhe 2/4 railcars, built by SLM / SAAS and numbered 11 and 12 arrived in 1949, being joined by No.13 in 1954 and No.14 in 1967.These were joined by class BDhe 4/4 No.15 in 1982.