When I was commuting into Toronto, someone struck one of the bridges on the Lakeshore line during the day. The bridge was taken out of commission until the engineers examined it. Problem was, the GO and VIA coach yards were out on the other side of the yard from Union Station, and rush hour was worked with a half dozen trains.
I am an advocate of putting a large steel girder over the road about 5 to 10 feet away from the bridge. All the entertainment value with none of the damage (to the railway).
Didn’t get a shot of it alas but near where I used to live a truck trailer combo lost a battle with a RR bridge, and the top was sheared off the trailer very much like opening a can of sardines with a key, and rolling it back.
I think it might have broken the back of the trailer too just as tomikawa described.
If this sort of thing interests you check out this webpage
http://www.trainweb.org/railpix/safety.html
Dave Nelson