Which of 'fast' and 'semi-fast' do the present-day fastest services correspond to? Did there used to be a service that made fewer calls than any service today?
In this case the 'fast' was Woking, Guildford, Haslemere, Petersfield (stop skipped midday but present in the evening), Havant, Fratton (?), PSS, PH.
Midday in 1982 the xx48 called only at Woking, Guildford, Haslemere, Havant, PSS, PH and was announced at Guildford as "the
very fast train" (but oddly, sometimes as the "semi-fast train" in manual announcements).
The 'semi-fast' was more "fast to Guildford, then slow". Woking, Guildford, then all except Hilsea.
The "slow" was Wimbledon, Surbiton then all, except Hilsea.
The fastest ever service in modern times was in the mid-to late-90s, the xx40 discussed above, I believe that called only at Guildford, Havant, Fratton and PSS, where it terminated.