The first class compartment was also dispensed with in the earlier compartment coaches. They were then operated with the designations BC4 Pr 00 or BC4 Pr 98a. The coaches were regularly adapted to meet changing requirements. For example, they were quickly fitted with plunger buffers in place of the cage buffers and with other brake hoses. The "Bachmann caps" on the skylights were also replaced by Wendler suction cups.
