I think it should also accept "He is the engineer of this train, not a passenger."
The English should read "not a passenger".
Got told "You used the wrong word" for saying "She is the engineer" not "He"
I somehow thought allowing he/she was automated.
It is train driver or driver of the train not train engineer.
Masinis is a vehicle driver (see KBBI dictionary) but that is marked wrong by Duolingo