Modernization of the Driving Bogie of the Electric Train ER-2
The author studies the problem of modernization of axle stage of springing of the bogie of the driving coach of the electric train ER-2, using particularly hydrofeders of Contitech company. The article contains information on design philosophy and possibilities of variation of rigid and dissipative features of hydrofeders, on practical realization of modernization of coach 121912 of electric train ER-2, trial running inspection of dynamic and strength properties there-of, guidelines for further work and study of possible adoption of such engineering decisions during capital repairs of ER-2.