I wouldn't get too excited. More flexibility to run 3 carriage trains probably will mean more 3 carriage operation of trains during shoulder peaks or even peaks on the Alamein line.
Highly unlikely.. seeing how much hot water Connex is in with "crush loads" running more 3 cars on high patronage line is only making the problem worse!
But with this in mind and sort of answering your question do the line really need a 6 car operations for a short line with many connections tram services into the city running near this train line..
Especially for a "shuttle" service between Camberwell and Alamein
But you're concern with peak service doing the 3... but like i said above with crush load...
Yeah the Alamein line is one where 3 carriages of peak and during shoulder peaks is acceptable. However, during peaks it is not normally good enough.
However, as for other lines, another type of train being available for breaking into 3 carriages probably can't mean that there are less options for Connex in running 3 instead of 6 carriage trains. As many folk know, some
of the 3 carriage running that goes on isn't exactly appropriate.