The Bosnian locomotive is designed very similarly to the Polish 797.819. The main propulsion consists of Caterpillar C 9 ACERT diesel engine rated at 250 kW, joined to Siemens asynchronous main generator of type 1FC2 284-4BO42. Rectified current is supplied to a TE 015 traction motor, which is fixed to a special frame under the rear hood. The traction motor drives through cardan shafts, final drive gear box and axle gear boxes both of the vehicle's axles. The power control is provided by a digital regulator type RV 08 by Slovakian NES Nová Dubnica. The driver's cab is heated by a Webasto independent air heater. The locomotive was also modified by the customer's requirements and meets local operational conditions in Bosnia and Herzegovina.
On the factory sidings of the power station in Tuzla (Termoelektrane Tuzla) the locomotive would be operated together with three older local shunters from the Đuro Đaković in Slavonski Brod production, having numbers 1 and 2 (built in 1991) and No. 5 (built in 1981). These locomotives are mostly used in local shunting service by the circular waggon tippers. Storing the coal trains is provided by class 661 locomotives of the State railways of Bosnia and Herzegovina Federation (ŽFBH, Željeznice Federacije Bosne i Hercegovine). If the locomotive proves good itself during three-month testings at the power plant, second locomotive of number 797.821 is going to be delivered, too.
On the upper picture from 31 July 2009 the 797.820 was spotted during a trial run frоm Jihlavа tо Havlíčkův Brod close to the target station. The bottom picture from 8 June 2008 shows the #2 locomotive stabled in front of the shed at the power plant in Tuzla.
Text & upper photo Daniel Brabenec, bottom photo Vlastimil Budař