While working on a photo documentary at the Republika power plant in Pernik (Western Bulgaria) I took a couple of shots of this locomotive:
(All Images Copyright 2013 © by Johann Brandstätter/ JB Photography)
Update: the locomotive shown is a pit railway locomotive type LEW EL 2 built by VEB Lokomotivbau Elektrotechnische Werke „Hans Beimler“ Hennigsdorf in East Germany. Over 200 were delivered to Bulgaria.
The loco is standard gauge, does not have any visible markings or nameplates. The only legible writing (apart from various warning signs) says ‘133 – Minipernik EAD – RNK Republika’, it is apparently used to transport coal from the open pit coal mines near Pernik to the Republika power plant.