The underground City Loop is at the centre of Melbourne's busy suburban railway system, currently operated by Metro Trains Melbourne. It's quite an unusual design, being made up of four completely independent single track tunnels, some of which change direction half way through the day. This video explains the physical layout of the Loop, the reason for the direction change, and some of the other confusing aspects of this part of the network. The Melbourne suburban network is 1600mm/5'3" Broad Gauge, and electrified at 1500v DC.

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This video includes several clips taken out the window of a Hitachi train travelling through the Loop. These were taken during the Hitachi farewell tour, and you can watch the full thing here:    • Farewell Hitachi tour through the Cit...  
You can watch lots more videos of the Melbourne City Loop as well as some other underground lines here:    • Underground Railways  

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