DENVER — A social media video taken at Denver International Airport went viral this week, showing one of the airport's trains running with the doors still open. It happened on Tuesday, and the video ...

DENVER (KDVR) — Engineers are investigating what caused a safety feature to fail after a train between concourses at the Denver International Airport ran with doors open earlier this week. A train ran ...

The launch of a new £7bn railway faces being delayed because of a row over who will control the opening and closing of carriage doors. The BBC understands train operator Chiltern Railways is in a ...