The caption translates as "South Front" but this is heavy armed train Jovan Kalita (Jovan Danilovich Kalita moscow count from XIV century) of white Army forces of South Rusia.
photo sources probably
ru.wikipedia.
-- Edited by nebojsa djokic on Thursday 20th of June 2013 12:35:29 AM
-- Edited by nebojsa djokic on Thursday 20th of June 2013 12:36:55 AM
"Ioann (John) Kalita" - heavy armoured train of Armed Forces of South of Russia (White Army), Russian Civil War, photo 1919 year. Had 3 guns 152, 127, 107 mm. Photo, if I'm not mistake, 1919 year. At right - commander of train colonel (polkovnik) A.A.Zelenetskiy.
From the Osprey book "Armored Units of the Russian Civil War White and Red" mentions a armored train of the Volunteer Army, 1st Corps, 2nd Armored train Divizion "Ivan Kalita" 18 October 1919. The chevron insignia was used by the volunteer army from early 1919 to April 1920 when it was replaced by the roundel. The book states that naval guns were mounted on this train in early 1920 when it wasw part of Wrangels Russian army where it was part of the 3rd Divizion.
It looks like a few of the men in the picture are wearing British army tunics. I hope this of some help or interest.