Applied to GUVs and CCTs during the 1970s/80s to indicate vehicles fitted with internal securing chains, suitable for use with BRUTE parcels trolleys.
As fitted to the lower right-hand vehicle end, the feint remnants of which can be seen on a GUV here.
As seen here on a CCT in 1980.
- See the full 3mm range here.
- Many packs in other scales can be re-scaled to 3mm, if there is demand.