21.  In a few more years they will have Internet ID cards, and may soon be watching real-time television broadcasts as they commute on underground trains.

22.  In a few more years, they will have Internet ID cards, and may soon be watching real-time television broadcasts as they commute on underground trains.

23.  It manufactures electric and diesel locomotives, high-speed trains, streetcars and underground trains, as well as signal and traffic control systems.

24.  Singaporeans also may be able to receive information while riding underground trains to work and play in the near future.

25.  The British government has since agreed to extend an underground train line to Canary Wharf, making it much more accessible.

26.  The city loop underground train line was also closed.

27.  He said a man with a Caucasian accent had called just after both bombings, threatening to extend the violence to the underground train system.

28.  For the fourth consecutive day, no underground metro trains ran in Paris or in the suburbs and buses were rare.

29.  The underground train network was closed and heavy traffic jams built up around the capital.

30.  Underground trains in Paris are to be equipped from next May with devices to stop would-be bombers placing explosives under the seats.