Another way is to use "multi-system" motive power that can operate under several different voltages and current types. In Europe, two-, three and four-system locomotives for cross frontier freight traffic are becoming a common sight (1.5 kV DC, 3 kV DC, 15 kV 16.7 Hz AC, 25 kV, 50 Hz AC). Locomotives and multiple units so equipped can, depending on line configuration and operation rules, pass from one electrification system to another without a stop, coasting for a short distance for the change over, past the dead section between the different voltages.