Track provided with an overhead catenary or a conductor rail to permit electric traction. The following types of electric current are in use:
- AC 25 000 Volts, 50 Hz
• 15 000 Volts, 16 2/3 Hz
- DC 3 000 Volts
• 1 500 Volts
• 750 Volts
• 660 Volts
• 630 Volts