1951 November, 'Pausanias', “To Greece by the "Simplon-Orient Express"”, in Railway Magazine, page 731:
From Belgrade the train is hauled by a 2-10-0, and makes good time through undulating country, with vineyards and herds of woolly pigs, over single line to Nish, where the Sofia and Istanbul portion, including through coaches (until recently) from Prague to Sofia, the capital of Bulgaria, is detached.
