The predecessor of 25G bus (G stands for improved type) is China Railway 25A bus. 199 1 year, following the successful trial-production and application of 168 25A new air-conditioned bus, the Ministry of Railways once again put forward the requirement of producing "upgraded 25.5m air-conditioned and non-air-conditioned buses". Changchun Bus Factory (now Changchun Railway Bus Co., Ltd.) was developed on the basis of 25A passenger cars. The design technical conditions of 25G bus are the same as those of 25A bus. Similarly, the roof is equipped with centralized unit air conditioning, and the air-conditioned generator car provides centralized power supply. However, on the premise of ensuring the quality and performance, the grade of production materials and equipment of 25G bus is slightly reduced, and the components of 25A bus are localized to reduce the cost. For example, household air conditioning units, electric control cabinets and so on. 25G passenger car 25G passenger car was produced in 1992, including hard-seat car (YZ), soft-seat car (RZ), hard-berth car (YW), soft-berth car (RW), dining car (ca), air-conditioned generator car (KD), luggage car (XL) and so on. The construction speed is 140km/h, and the maximum allowable speed is 120km/h, because it is necessary to meet the emergency braking distance requirement of 800m straight (when the speed is 140km/h, the emergency braking distance is 1200m). 25B Bus is a 25G non-air conditioning version. 25G bus manufacturers include Changchun Rail Bus, Tangshan Rail Bus, Sifang Locomotive and Rolling Stock Factory and Nanjing Puzhen Vehicle Factory. Over the years, many improvements have been made to bogies and car bodies, for example, some parts have been changed to locomotive power supply system, closed doors, inverted windows, sealed windshield and so on. There are still new orders for 25G buses. On June 5438+065438+1October 14, 2008, the Ministry of Railways conducted the "First Tender for Railway Passenger Cars of the Ministry of Railways in 2009" and purchased 1500 passenger cars. At the end of 65438+2009 10, the Ministry of Railways conducted the "Second Tender for Railway Passenger Cars in 2009", and subsequently purchased 1500 25G passenger cars. The main colors of China Railway 25G bus are red and white, so it is also commonly known as "red leather car".