The train kept going, and we left that place behind.

The train kept slowing down, and before very long it came to a complete stop.

"You can fiddle with the switches, maybe change the direction a bit, but the train will keep on coming."

But if the operator slows to less than five miles an hour, the train can go past, or "key by," the signal and keep going.

The train keeps moving on - not always on rail.

The train keeps going, rumbling by like a great steel dragon.

That train of thought can keep one up nights figuring out ways to find out.

As long as the train keeps moving, his location cannot be determined.

Maybe they divert the trains to keep the final destination secret".

And still the train kept curving round that interminable corner.