Algodoo

New York City, January 15th 2014. 4:25 p.m. (16:25 in my country)
In a railroad crossing, a bus is stuck on the tracks. No one noticed the red flashing lights. They just thought they were stuck. They didn't get out of the bus.
The train is coming at highspeed. It cannot stop. The bus get hit by the really fast going train. Debris of the bus hit a school bus which stopped as normal. Behind the school bus, another simple bus which didn't get hit by debris.

75 deaths with: 5 persons hit by the train, 10 persons hit by debris, 15 children hit by debris INSIDE the school bus, 5 children hit by debris FROM the school bus,
10 simply hit, 15 persons which got out of the bus but got hit by train and 10 which got out of the bus but got hit by debris.