What happened to the Girling self-powered wheel slide protection that was fitted to HST▸ trailer cars?
The HST trailers are fitted with WSP. The Girling system was mainly fitted to MkIII
LHCS▸ . You also have a
BR▸ version but most are fitted with the Knorr-Bremse system.
You can normally see the wires on the outside of the bogie, normally painted orange when the wheelsets are overhauled.