Possible Indian troubles was about the only condition that kept large trains together for mutual protection.

The works involved the use of temporary track to keep trains running, and raising the station 6 metres.

"Do you know that your job is to keep trains moving?"

To keep the buses and trains running, the transit system must be properly financed.

For westbound freights, the issue was keeping trains from going too fast.

However, the company brought in 1,000 managers and other employees to keep trains running.

So far, the costs and technological difficulties have kept such trains from being used in a big way.

However, manual blocking that kept trains in stations until the train ahead had left its station were mandated for several years.

The challenge: come up with a way to keep trains running without using a majority of subway tracks in lower Manhattan.

Today, transit police tried to keep trains, traffic and pedestrians safely separate.