You had a mistake... سامانه 6 and سامانه 9
Is one... we have not سامانه 9 now .. .. this changed the neme of سامانه 6

But it shows 9 on the photo and route is placed by the day photo was taken.

Nice photo.The confusion has a reason.There are currently 7 depot at Tehran and suburb united bus company.Depot 1 to 6 plus "Disabled and veterans depot" The last one has special equipment buses(O457s and O355s operated by "Rahro seir Ghaem" company) and vans (Iveco vans) to serve disabled and veterans.
Right now there are 10 brt lines and 6 Depot:
Depot 1 (سامانه ۱): BRT route 1
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Depot 2 (سامانه ۲): BRT route 2
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Depot 3 (سامانه ۳): BRT route 3 ,route 5 and route 6
(Means all buses of route 5 where transferred to Depot 3 from Depot 5)(route 6 is currently operated by "Ta'avoni Neda-ye Behavaran" company with newly acquired Zamyad EuroRider C35 buses)
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Depot 4 (سامانه ۴): BRT route 4 , route 7 and route 8
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Depot 5 (سامانه 5): BRT route 10 (previously route 5 as well, but route 5 was transferred to Depot 3./before that there was another depot.depot 10 which was responsible for BRT 10.then this two depots (5 and 10) merged)
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Depot 6 (سامانه ۶): BRT route 9.
(Previously Depot 9, renamed Depot 6 after merge of Depot 5 and 10)
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Many years ago there were Depot 7 and 8 .I could not find any history of them unfortunately.

This bus belongs to last batches of delivered KingLonges.most probably 2012 and later.post facelift model.has better interior design and seats compared to older KingLongs.

Route 8 serves the depot 2
http://fotobus.msk.ru/photo/1662807/

Цитата (Erfan, 16.12.2016):
> Depot 4 (سامانه ۴): BRT route 4 , route 7 and route 8
only BRT route 4, route 7

So it's probably newest change.