Electronic Solutions Ulm
Electronic Solutions Ulm (known as ESU) is a German manufacturer of accessories for model trains, especially known for their locomotive decoders.
The products include the LokPilot and LokSound series of decoders and recently the Märklin company has teamed up with ESU for the manufacture of the decoders for their new generation of locomotive decoders.
ESU was one of the first manufacturers to produce decoders capable of producing sounds - a feature that has become very popular with model railroaders. Their Loksound v3 decoders have the added benefit that end-users can re-program the sound images that are used within the decoder, using a LokProgrammer.
Some of their decoders such as the LokPilot and LokSound are multiprotocol in that they support the Motorola format as well as Digital Command Control (DCC) and also Märklin style analog AC current. Their LokPilotDCC on the other hand is a pure DCC decoder and will not work in a pure Märklin/Motorola environment.