It is also one of the most secure locations on the planet. It is a United States military base (a detachment from Edwards Air Force Base in CA) where no one knows whatâs occurring, except those that work there and the President.
The standard time at a crossing is 10 min., but after the 10 min. has exspired the train can move one car link forward or backwards and regain another 10 min.
You can use this for transport when a train has been delayed by a certain period of time, say 20 minutes and you would be told that the train is running 20 minutes late.Alan_________________English as a Second LanguageYou can read my ESL story Present Simple. Alan.