The Hong Kong tram, with its double-deckers, has become a symbol of the city. It celebrated its one-hundredth anniversary in 2004, yet still looks as young as ever.
Hong Kong locals are particularly fond of their tram, the subject of many a childhood memory or family anecdote. It has garnered the affectionate nickname of "Ding Ding".
The tram's main challenge is to transport 200,000 passengers every day in one of the most densely populated cities in the world. All the while, it remains one of the most environmentally-friendly forms of transportation.