[sport]

All they have to do is download the black box in the engine. It will tell them everything they need to know.

[citizen]

The article text above mentions that an assessment of the train's movement and speed were "based on the train’s track image recorder." I don't know if the track image recorder is the black box but they did recover the black box, I read.

[woodbutcher1963]

Yes, it will tell everything about the train(rate, braking, rpm, etc.)

However, the phone records will tell if just prior to, leading up to the accident whether he was texting or on his cell phone and distracted from doing his job. IF, they determine this, he could be charged with manslaughter. This is probably why he immediately lawyered up.