"But every crossing has some sort of protection, whether it's a stop sign or a trainman jumping off a slow-moving train to hold up traffic," he said.

All four incidents involved slow-moving trains, and no injuries resulted.

They now must sound the horn a quarter-mile from a crossing, which for a slow-moving train can be much longer than 20 seconds.

From the window of the slow-moving train I could see the narrow muddy spaces between the houses.

Valentine put his finger on the U-gun's trigger guard as the slow-moving train of people-or what had once been people- approached.

She tapped the steering wheel, glaring at the slow-moving train.

A fog was rolling in; I could barely see ten feet beyond the grime-specked window of the slow-moving train.

The system will also bring a slow-moving train to a halt, Mr. Coleman said.

He said that every day cars try to beat the slow-moving train, and that yesterday was no different.

As Jan sped along beside the slow-moving trains he wondered what the next emergency would be.