The freight train derailed. (Hint: What)

It derailed 40 miles north of Sacramento. (Hint: Where)

It derailed 40 miles north of Sacramento. (Hint: How)

It derailed north of Sacramento. (Hint: Which)

Authorities are investigating the cause. (Hint: Who)

The head engineer said everything was fine. (Hint: Who)

Twenty-two went off the tracks. (Hint: Where)

It did not involve any fatalities. (Hint: How)

He was treated for a broken wrist. (Hint: What)

They frequently carry dangerous cargoes. (Hint: How)