It's either all mix or no mix.
The current situation is worst, where u only got some mix
When u all mix at least all ops are ready to deal w diff models.
When u have only some mix the other ops lose out!
Even Transperth distributes different bus models equally between
operators. However, some depots have only one type, eg Gosnells
only has CNG Merc OC500LEs, North Fremantle only O405NHs.
GAG in Singapore only sticks to Citaro and B9TL. What if they
win the tender for CCK or WDL package? They will need to take over
some SMB-spec MANs.