In conclusion of the last year a manufacturing of another one exemplar of rebuilt two-axled shunters by CZ LOKO was finalized. It's the 797.819 locomotive, a member of class 797 family, which all have been built up in the factory works in Jihlava. This one was ordered by a Polish customer, the Varsovian Underground Authority (METRO WARSZAWSKIE Sp. z o. o.), where the locomotive is going to be used in technological duties within the underground maintenance.
Class 797.8 locomotives were initially built under the Prague's Transit Authority order, predetermined also for maintenance duties at the Prague's underground system. Totally 17 exemplars were delivered, equipped with Liaz M 1.2C M 640 SE diesel engines. Then in 2005 the Prague's Transit Authority sold the 797.803 back to the manufacturer (the ČMKS at the time), where it was overhauled and resold to Hungary (see 797.803 locomotive sold to the Budapest underground
). Then the Prague's Transit Authority compensated a missing engine by purchasing the newly built 797.818 locomotive, equipped with Caterpillar C-9 ATAAC diesel engine and new hoods according to an upgraded design (see Production of 797.818 locomotive finished in ČMKS - JLS Jihlava
). From this modified model the newly built 797.819 goes out.
The 797.819 locomotive grown up of class 701 shunters reconstructions. On the overhauled original main frame and undercarriage a new driver's cab and hoods were installed. The main propulsion consists of Caterpillar C-9 ATAAC diesel engine rated at 250 kW, joined to the Siemens main generator of type 1FC2 284-4BO42, which is supplying one TE 005 traction motor with rectified current. The traction motor is fixed to a special frame under the rear hood. Through cardan shafts, new final drive gear box of type TK 140 and through axle gear boxes the traction motor drives both vehicle's axles. In contrary of the 797.818, this locomotive is not equipped with a remote control device and the power control is provided by a new fully digital regulator of type RV 08 by Slovakian NES Nová Dubnica.
Neither the 797.803 to Hungary, nor the 797.819 had been transported to Poland by rails, as its conveyance was provided by a road trailer, too. The upper picture spotted the locomotive loaded on the trailer just before its leaving the area of the CZ LOKO works in Jihlava. The bottom picture shows the road transport itself on the Czech D1 highway towards the purchaser.
Text Daniel Brabenec, photo Vlastimil Budař