Ni-Fe accumulators are used as part of batteries 40FM-250P, 40FM-300P, 84FM-350P for backup power supply of electric equipment of railway passenger carriages, diner and other special-purpose cars (mail and so on).

Ni-Cd accumulators are used as part of batteries 40,84KL 250 P, 40,84KL 300 P, 40,84KL 350 P for direct current power supply of electric equipment of railway passenger carriages, in service conditions according to M group by ГОСТ 17516.1.