In 1928, twenty five bogie cattle vans were built and placed into service. They were fitted with 'barframe' bogies.
They were built with autocoupler equipment but were fitted with 'transition hooks' for compatability. They were fitted with auto-couplers 1933 and 1936.
Between 1965 and 1973, the vans were upgraded and fitted with roller bearing bogies. They were recoded MF when modified.
The MF lettering remained until the 1979 recoding when they were relettered to VSBY. Between 1979 and 1983 only ten vehicles were recoded.
Those not recoded had been scrapped or removed from service.
The vehicles recoded to VSBY were: 2 - 5, 10, 15, 20 - 22 and 25.
The vehicles were removed from service in the mid 1980's.