Greek Θγ 556 (Theta-gamma 556) in the early 1970s (75 km/h, former USATC Class S160 No. 3327, built by ALCo American Locomotive Company in 1944) (coll. Georg Carr, source: Rail Thing - Vanished Rail Scenes facebook page)
(USATC: United States Army Transportation Corps)
I cannot work out what that is in the background to the right of the picture.

Greek Θγ (Thg, Theta-gamma) 525 at Larissa station on 26.4.1980 (75 km/h, former USATC Class S160 No. 2206, built by Lima Locomotive Works in 1943) (photo by John Scrace)
Smoke box cleaning of Greek Θγ (Thg, Theta-gamma) 525 steam locomotive at Thessaloniki locomotive shed on 16 November 1986 (75 km/h, USATC Class S160 No. 2206 to 1947, built by Lima Locomotive Works in 1943) (photo by A. Klonos, drehscheibe-online.de)