CANopen on track – IEC 61375-3-3 voted positively The very first IEC meeting on international standardization of CANopen for the use in rolling stock went back to February 2005 in Verona (Italy). After seven years, the IEC 61375-3-3 document named “Electronic railway equipment – Train Communication System (TCN) – Part 3-3: CANopen Consist Network” was unanimously approved by April 2012.