Locomotive 40 1020 of the Bulgarian private operator BZK photographed at the station of Pirdop. Like the other machines of BZK at that time, 40 1020 is also an ex-GFR (Grup Feroviar Roman) locomotive. Note that this track has no overhead catenary. 10 December 2006 Photo by Miroslav Georgiev (miroslav_sg@all.bg)