You Cannot See Through Trees And Walls
Just in case there is any doubt that the operator had very little time to see the stopped train, we go back to the wonder of Google Street View (since I am too lazy to go there myself and take a picture).The picture below is standing on the bridge on New Hampshire Avenue looking north. The stopped train was actually a couple hundred feet south of here. We are looking north, while the train operator would have been looking from the north towards us. But obviously, if we can't see around the corner to the north, then she could not see around the corner to the south. You can click the photo to see a larger version.
Finally, here is another version of the same overhead view showing lines of sight from further back, to the spot where the other train was stopped. The lines pass through buildings and trees. There is no way the operator could have had more than about 500 feet to see the stopped train. The building on the left from the street view is the closest building to the bridge here, barely 200 feet. The building on the right from the first image is the large building near where the train is photographed in the satellite image. It is about 400 feet from the bridge. This is basically the limit of visibility.
But the operator would have not even have been able to see the train from there - the train was stopped 200 feet further south of the bridge, further around the corner and also obstructed by the bridge itself.