Together with the four-axle passenger train Coach es, luggage cars of a corresponding design were also purchased. These were also taken over by the SBB on nationalisation but disappeared from the stock much faster than the passenger Coach es. However, due to their large storage space, they were extremely suitable as service cars and for stationary use as a store. In contrast to Germany, a four-axle Coach of American type remained in Switzerland. The BC4 with the number 4952 was renovated and can be inspected today in the Swiss Transport Museum in Lucerne.