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  3. London’s First Light Rail System Docklands Light Railway (DLR) took just t...

London’s First Light Rail System Docklands Light Railway (DLR) took just t...

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问题 London’s First Light Rail System
Docklands Light Railway (DLR) took just three years to build at a cost of ￡ 77 million It is London’s first Light Rail System，but its route follows that of a number of older lines which carried the nineteenth century railways through the crowded districts of the East End.
The section of the line from the Tower Gateway Station to Poplar follows the line of one of london's earliest railways, the London Blackwell (1840), a cable-drawn railway (later converted to steam) which carried passengers to steam ships at Blackwell Pier, and provided
transport for the messengers and clerks who went backwards and forwards between the docks （码头）and the city every day.
From Poplar to Island Gardens，a new line crosses high above the dock waters，and then joins the old track of the Millwall Extension Railway, built to service the Millwall Docks (1868) and to provide transport for workers in the local factories. This line was horsepart drawns for part of its route, until the 1880s.
The Poplar to Stratford section of the DLR route was first developed by the North London Railway, built in the 1850s to link the West and East India Docks with the manufacturing districts of the Midlands and North of England. There were major railway works and sidings （岔线）at Bow until recently.
The trains are automatically controlled from a central computer, which deals with all signaling and other safety factors, as well as adjusting speeds to keep within the timetable；on board each vehicle, Train Captains, who are also fully qualified drivers, are equipped with two-way radios to maintain contact with central control. There are passenger lifts, and selfservice ticket machines, at every station.
The trains on the DLR are controlled by
选项 A an on-board central computer.
B acomputerengineeronboard.
C two-way radios operated by the drivers.
D a computer center based somewhere along the line.
答案A
解析
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