11.  But public transport, in the form of light rail lines or underground trains, requires a huge investment of public money.

12.  He invested huge sums in an underground train tunnel to Manhattan that eventually had to be abandoned.

13.  Or an underground train coming into a station.

14.  The bomb went off on a crowded underground train at the height of the evening rush-hour.

15.  The incident began where arriving passengers stream into the main terminal on four long escalators, coming up from their gates on an underground train system.

16.  An elderly man died Tuesday after he was stuck in the door of an underground train and dragged along the platform in Stockholm, authorities said.

17.  He said police patrols inside the airport and at its underground train station had been increased.

18.  He said that police patrols inside the airport and at its underground train station had been increased.

19.  High-speed trains began carrying passengers between central London and Heathrow airport Tuesday, offering an alternative to congested highways and slow-moving Underground trains.