By the way for the future 550 Wrights, it is likely 269 of them
will take up SBS7730J to SBS7887M and SBS7889H to SBS7999Z, then
the remaining 281 Wrights will take up somewhere right after
3300-series (It is not convenient for me to shout out the regos
because someone may be unhappy).
That's true, although there are 30 vacancies after SBS3269Z.
Factoring in the de-registration of buses by the end of 2014, not
factoring in extensions, SBST would have 1-1999, 2000-2887,
2889-2987, 3552-3999, 4000-4999, 6750-6999, 7000-7299, 9000-9400,
9691-9799, 9840-9887 and 9890-9999 free.
That's 2000+888+99+448+1000+250+300+401+109+48+110 = 5653
vacancies, meaning SBST would have a fleet of 4346.