That's a good question... There must be more in use and probably all of them at Thessaloniki. I saw one pushing a kioleidis train towards the passenger wagons shed last December. In Agios Ioannis there is one (A102) but I think it's not operational.
And there is propably one in Athens, as when the Marklin V60 was presented, they had also a real one with OSE liveries in Rouf to show it to everyone.It was fresh painted and seemed like a new one......it is propably A102