It is precisely the fact it overlaps Sv. 854 route that makes it
so "high-class". It duplicates Sv. 55 from AMK Ave 10 all the way
to Sims Ave, and so to show-off to Sv. 854 pax, SBST deploy new
buses on the service to "entice" people to get on Sv. 25, although
for me I'd rather take a fast and smooth O405G on Sv. 854 than a
noisy, sluggish B10TL on Sv. 25..
The Sv. 74 buses that jut in at AMK is to help cope with passenger
load along AMK - HG Central corridor. Sv. 74 is controlled by only
TWO depots, HGDEP and BBDEP.