If a train needs to back up because of an emergency, all the trains behind it have to be cleared.

This way, the train does not need to stop.

Every train needs a driver to make it run right.

It's too late to get away then because you have to have the money like a train needs tracks.

While few trains needs extension and Change in frequency such as:

Some trains needed a locomotive at each end to travel that 3/4 of a mile.

To pick up speed, though, the train needs passengers in the form of players.

To be profitable, he said, the trains need double that number.

Some express trains use 75-foot cars, too, and need fewer cars.

To reduce the weight, the trains needed to have some steel parts replaced with aluminum.