The development of the railway industry, changes introduced in the infrastructure as well as constant improvements of electric drives definitely challenge manufacturers of electromagnetic components. On the one hand, the demanding sector expects from producers high quality optimised products, suitable for extreme environmental conditions such as ingress of dirt and moisture but also possible mechanical exposure. On the other hand, high competitiveness of manufactured goods is expected. Rolling stock industry is demanding also in terms of the restrictions and standards applied. For decades, ELHAND Transformatory has been perceived as a recognised supplier for such components as transformers or air reactors used in frequency converters. Those, fed directly from the traction, are usually mounted on vehicles’ roofs and work under severe conditions. Owing to the extensive experience, our products are also used in railway substations, installed in high-current power supply systems.