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I don't know about now, but in the mid-2000s line 49 on weekends was serviced by diesel buses and trolleybuses at other times. Same was true for line 1 too, but there was some electrics there even on weekends.
That's possible, my visit was limited to workdays - I haven't seen any bustitution on the trolleybus routes, including late evenings (while I've seen a lot of buses working as cable cars!)