Complex sentence: Zürich's tram network is built to metre gauge (gauge) and is electrified using overhead line at 600 V DC. The electrical supply system is shared with the city's trolleybus network.
Split into simpler sentences: Zürich's tram network is built to metre gauge (gauge). The tracks are electrified using overhead line at 600 V DC, utilising a supply system shared with the city's trolleybus network.