I'm sorry to labour the point must I must take issue with this, you will probably disagree but nevertheless in the interests of balance I have to point out that the idea of people being sent home after an hour or so of being spare as a matter of course is unbelievable. Just how long does it take for a 'good service' to become 'major delays'? All it takes is one points failure, one track circuit failure, one trespasser, one failed train or heaven forbid one fatality. There would be serious questions being asked of the resource managers if this was the case. Standard practice is generally that you don't go home until you have a maximum of two hours remaining on your shift, and that's provided that there is no disruption and that there is at least one other spare person remaining.
Bournemouth to Poole and back, Fratton to Portsmouth and back, Woking to Guildford and back, these are all trips that can be done in 30-40 minutes or less which is why nobody is going home six or seven hours early.