During 1961/1962 thirty two BLF wagons built. In the same period, wagons of the same design with codes _BB_ and _BF_ were recoded to BLF.
The BLF number group was 23 - 151.
This group comprises one hundred and twenty-nine vans. The vans are the identical underframe and body style to the early VLX_ louvre vans except pressed panels were used for the sides and ends.
The number group starts at '23' as numbers 1 - 21 were _BB_ ex _TT_vans and number '22' was _BB_ prototype of vans that became _BP_ and BMX_ classes.
The BLF vans initially entered service as 'BB' with plain bearing bogies. Some vans entered service with roller bearing bogies and were issued with the 'BF' coding. The same number group was retained.
Between 1963 and 1965 all the BLF vans, numbered 23 - 151 were recoded to BLX_ with the same numbers retained.
In 1967/1968 twenty four vans were placed into dedicated palletised cement traffic. These vans were recoded from BLX back to BLF. The numbers were 121 to 144. All vans were stencilled at the left hand end of each side.
These vans were loaded at the cement plant at Fyansford, near Geelong. The cement was then consigned to areas within the Melbourne metropolitan area and certain cement depots at country locations.
In the 1979 recoding the BLF class was relettered to VBBY.
In the late 1980s the letter 'Y' was dropped in lieu of 'F'. The class was relettered from VBBY to VBBF.
The class was in storage from 1991. Scrappings started in 1993.