Maniac Magee

From the text:

One day his parents left him with a sitter and took the P & W high-speed trolley into the city. On the way back home, they were on board when the P & W had its famous crash, when the motorman was drunk and took the high trestle over the Schuylkill River at sixty miles an hour, and the whole kaboodle took a swan dive into the water.

And just like that, Maniac was an orphan. He was three years old.