There are some technical differences between the IC2 and the IC3. The most obvious is of course the smaller number of carriages, and other engines (the IC3 has four engines, each delivering approx. ; the IC2 has two engines, each delivering approx. ). Other differences include the way the engines are cooled (the IC3 engines are air-cooled, but due to several technical issues with this system, it were decided to use water-cooled engines), electric-driven AC system (another thing decided after experience with the IC3, which AC system were powered directly from the engines).