The LF sheepvans were converted from the mid 1960's to the early 1970's by replacing plain bearing bogies on _LL_ vans with roller bearing types.
The LF number group was 1 - 50.
Ten vans coded _LP_ were converted to LF in 1974/1975., with original numbers retained.
In the 1979 recoding, the LF class were relettered to VSAY.