从1956年起,装有(?)-X3-0型转向架的四轴货车比以前采用MT-50型转向架的四轴货车在运行品质方面有很大改进。随着车辆运用强度的增长,对车辆走行部,首先是对转向架主要零部件的要求也不断提高。因此,转向架生产的主要企业——乌拉尔车辆制造厂,同科研部门及铁路高校一直在积极进行改进货车转向架结构的工作,以提高其强度、可靠性和使用寿命。 60年代曾采用过新型的摇枕下心盘结构 Since 1956, four-axle trucks equipped with (?) - X3-0 bogies have significantly improved their operational quality compared to the four-axle trucks formerly equipped with MT-50 bogies. As the strength of vehicles increases, the requirements for the main components of the bogie are also increasing for the traveling department of vehicles. Therefore, the main bogie manufacturing enterprises - Ural car factory, with scientific research departments and railway colleges and universities have been actively improving the truck bogie structure to enhance its strength, reliability and service life. In the 1960s, a new type of mandibular structure was used