TRAINS AND TUNNELS one hundred and sixty kilometres an hour through the Channel Tunnel is fast but the fastest speed reached by a train was 581 kilometres an hour. A train in Japan did this in 2003. In Hong Kong, when you go by train from the airport to the city centre, you through 8 kilometres of tunnels, including one tunnel under the water trav of Victoria Harbour. You also travel over a number of bridges, including the spectacular Tsing Ma Bridge. It is one of the longest bridges in the world, at 1,377 metres. The entire journey takes just minutes. When a link was built across the water between Denmark and Sweden, an island was created in the middle of the water. The island is 4 kilometres long. From Denmark, cars and trains travel the first part of the journey through a 4-kilometre tunnel to the island. Then, from the island, they go over a bridge which is 7.8 kilometres long to Sweden. The link was opened in 2000.