TET ESTEL, founded in 1870, offers high-quality and innovative products of its own design and production, including equipment for rolling stock and traction substations.

First Mercury rectifier unit for an electric locomotive was developed and released by TET ESTEL in 1958.

Currently, TET ESTEL company produces various kinds of transformative technology units for electric rolling stock, passenger cars, traction substations and underground, as well as offering complete technical and engineering solutions in this area.

During the years of activity TET ESTEL has delivered more than 12 000 pieces of equipment for railway, subway and urban electric transport.