11.   The automatic train protection system kicked in during the derailment, cushioning the blow for commuters, Blythe said.

12.   The Clinton proposal puts off some tough decisions on how to pay for the Amtrak train system.

13.   The Hoboken lines had an automatic train control system many years ago, federal regulators said.

14.   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.

15.   The IRA has caused a series of disruptions since the campaign began, with bombs and bomb threats that have convulsed highways, train systems and city centers.

16.   The many British visitors who travel the sleek and modern railways in the rest of Europe are made aware of the stark contrasts with the train system at home.

17.   The train protection system was built into the light rail system in St. Louis and on the one that will open next year in Dallas.

18.   The train system works with precision.

19.   The trick for someone unfamiliar with the train system is to enter at a strategic site.

20.   Three weeks ago, the company was chosen to develop an express train system in Florida.