Energy Meter for On-Board Traction applications. To be ,used both in new multi-system locomotives and for retrofitting to all types of electrical rail vehicles already in operation.,Supply systems 25 kV 50/60 Hz and 15 kV 16.7 Hz, or either 600 V DC, 750 V DC, 1.5 kV DC or 3 kV DC. A system change is detected by the energy meter and stored in the load profile ,EM4T complies to all the requirements of EN 50463-x & EN 50155 standards for metering and On-Board use, and thus satisfies the requirements of EC Decision 2011/291/EC (TSI “Locomotives and passenger rolling stock”).