I don't think the track was built for high speed. I think it was an old line that had been upgraded. The curve is pretty tight; the photo here shows it well. The train was travelling away from the camera and just went straight on. The loco on the bridge was the rear one.

From that picture it looks like the line of the original track might have been diverted when the road was built. But I don't know which was built first.

I wonder if drivers have to 'learn' a new route, as they do in the UK.