From 1932, its track number was Ca 5422, it was transferred to GYSEV in 1956, and with the abolition of the third class, it received the track number Ba 251. From 1967, it operated as B serial number 50 43 29-28 251-3. After being renovated as a nostalgia carriage, it was returned to MÁV, at that time it had the track number 30 55 117 9002-7.
Since third-class carriages with serial number C can no longer be put into service today, their serial number has become B, but as it is a nostalgia carriage, it continues to operate as 3rd class.