You're probably correct in terms of the basic cause. A more similar wreck might be the one in Denver a little while back where a LRV train derailed on a curve at more the 15 mph limit (sharp turn into a cross street, much like this one). There used to be lots of evidence in the asphalt and sharp turns on the Muni of streetcars taking alternative routes.

DuPont was not the only excess-speed-on-curvve wreck on Amtrak in recent years. ISTR a bad one one in Philly as well. Main difference is that there are usually more people on an Amtrak train than on a LRV, and with the higher speeds of mainline rail there's more energy available to do bad things. This one looks like it just buried one unit or so of the car in the store. Basically a city bus wreck.

Side note: that's an interesting car design. Lots of little units, each barely long enough for a seat or 2 or a door set. Looks very flexible but I wonder about stability above downtown streetcar speeds. Most I've seen per "car" in the US is maybe 3 "units" often with the center one providing the propulsion.