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东德国营高尔利茨车辆厂对国际联运的卧车作了进一步改进。在已往设计和制造车辆方面取得的经验的基础上,到1977年底已制造了五种新型卧车样品。在开始的冬运试验中获得了良好的结果。在设计工作中吸收了为苏联铁路制造的强迫通风卧车的经验,也注意了运用的可靠性。这种车与过去的设计一样,适合在轨距1,435毫米和1,524毫米两种线路上运行,可在+50～-50℃的外温条件下运用,符合UIC(国际铁路联盟)和RIC(国际客车行李车互用协定)的全部规定和过境运输以及在1,524毫米线路上运用的全部要求。
The East German state-owned Görlitz Vehicle Factory made further improvements to the international intercourse sleeper. Building on previous experience gained in the design and manufacture of vehicles, five new sleeper samples have been manufactured by the end of 1977. Good results were obtained in the initial winter run test. The design work absorbed the experience of forced ventilation sleeves made for the Soviet railway, and also paid attention to the reliability of the application. As with previous designs, the car is suitable for both 1,435mm and 1,524mm gauge tracks and operates at ambient temperatures from + 50 to -50 ° C, in line with UIC (International Union of Railways) and RIC (International Passenger baggage car interoperability agreement) and all the requirements of transit transport, as well as in the 1,524 mm line.