Sydney Trains - Tangara non-ATP (automatic train protection) cabs on T129 (ex-G set) + T74

At Central station where I spotted Tangara T sets T129 and T74 with “non ATP cabs” stickers on the front emergency doors. However the other ends of these sets don’t have the non ATP cabs signs, which I guess signals they do have Automatic Train Protection. This could be part of the Tangara Technology Update (TTU).