SD-9 storage battery locomotives

The loco type SD-9, often called track-coolie are made by Northern-Hungarian Building Machine Repairing and Constructing Company in the 60-70ies. The very simple construction is still working in some brickyards (for example in Törökszentmiklós), and a sawmill in Vinye. The 2-axle 9-12 HP loco, which can crawl forward with 6, backward with 10 km/h, originally equipped with single-cylinder diesel engine type BL-12 and chain-drive. Two of them worked in a fattener in Szentes, where they modified to chopper-controlled electric locomotives with accumulators.