Duagon
Duagon is a Swiss supplier of embedded electronics and network components for train communication, headquartered in Dietikon and covering the fieldbus and Ethernet technologies used across European rolling stock.
The company was founded in September 1995, as the railway industry was establishing the Multifunction Vehicle Bus (MVB) as the fieldbus standard for data communication in rail vehicles. It celebrated its 30th anniversary in 2025.
Since 7 January 2026, Duagon has been part of the Knorr-Bremse Group, following the acquisition of the company from a private equity fund advised by Deutsche Beteiligungs AG.
Duagon develops and manufactures communication products for train automation in Dietikon, while its Nuremberg site focuses on embedded computing and Madrid is its largest software location.
Core products and services
The portfolio spans the train communication network — the onboard layer of railway connectivity and communications — with interfaces for MVB, the Wire Train Bus (WTB) and the Controller Area Network (CAN). These sit alongside real-time Ethernet products supporting protocols such as the Train Real-time Data Protocol (TRDP), IPTCom, the Common Industrial Protocol (CIP) and PROFINET.
Gateways, repeaters, switches and diagnostic tools complete the network offering. Interface cards are available in form factors from PC/104 to CompactPCI, with host drivers supplied in C source code.
On top of the network layer, the company delivers control and monitoring systems for subsystems such as doors, brakes, air conditioning and condition-based maintenance, as well as complete Train Control and Management Systems.
This combination covers industrial networking for rail: the deterministic onboard data communication that connects a vehicle’s subsystems.
Market position
Customers include vehicle manufacturers, system integrators and railway infrastructure companies. The product range covers all major fieldbuses used on current rolling stock, with products designed for long-term availability across vehicle lifecycles.
Beyond rail, the same embedded platforms serve medical technology and critical automation.
Current activity
The transaction was reported at EUR 500 million. Knorr-Bremse expects its Selectron business and Duagon together to generate annual revenue of approximately EUR 250 million, combining around 1,000 electronics and software specialists.
