I saw 1278 last Friday coming over the Foyle bridge.
2570 is Derry's entry to the Bus Rally, it was to be 163, but then they changed it. Are you going up to Cultra?
1209 has been allocated to the country (LD)for some time now. A general rule to know if a bus is allocated to the country or city is, if it has city destination blinds like, Antnagelvin, Nelson Drive, Kilfennan etc then it is a city bus other wise it is a country bus, don't forget that Curryneirn, Ballymagroarty and Gobnascale are sometimes served by country duties.
I assume AN was a misprint for Antrim (AT) as there is no such depot code. Also 1209 like the other Tigers in its batch has only one camera about the destination box facing down the bus.