Creepy dream

I dreamed about this during my afternoon nap this afternoon. I wonder what it means, if anything at all...

I was in my mum's room. I vaguely remember that the room was very large, and pretty much empty. There were 3 big glass windows on each side of the room. Each window had a large glass window pane that swung open on vertical hinges.

I heard a train's whistle blowing, so I went to the 1st window to see if there was a train. There was nothing outside the 1st window. There may have been a field of some sort, but I can't really recall.

So I went to the 2nd window and looked out. There was a train yard with a few trains, but none of them were moving. The train yard looked old. The trains were brownish (rusty perhaps?) and looked somewhat neglected, and like they had seen better years. I think there were two trains, or perhaps there were 3. Once again, I can't be absolutely sure. Anyway, there didn't seem like there was anything interesting there, so I went to the 3rd window.

There was nothing outside the 3rd window. But when I looked at the glass in the 3rd window pane, I could see the reflection of a train moving through the train yard. It seemed like it was moving from the left side of the window pane to the right side. I never saw the head or the tail ends of the train, only the middle sections. I turned back to the second window and looked, and there was nothing moving at all...