Some photos show the burning on the right side of the arch. Others show it from the left side. It depends on whether it was photographed from the north side or the south side of the bridge. My first impression was that it was close to the Russian end of the bridge. Also you can see the progression from dawn to daylight as more photos show up.
Oh my Lord, I see the train in that photo for the first time. I wonder where the HIMARS system is that hit this? lol