3DTS_UP_LtwtCoach_5468 says that a modern lightweight passenger car weighs 65 tons.
If so how can they be "strong and heavy" to widthstand colissions with other trains.
I googled about it and it only said passenger cars weigh 65 tons and the "FRA requires them to be strong and heavy."
If that is the case, I don't think 65 tons of steel could possibly widthstand a hit with up to 15,000 tons.