The crash, between a moving train and another that was stopped further up the track, was caused by an "inexplicable" error, the transport minister said.
The defeated Brazilian candidate claims to be the victim of a coup d’état and political persecution, recycling unsubstantiated allegations of “electoral fraud”.
Estevao faces limited opportunities at Chelsea as Pedro Neto’s form and competition for places in attack leave him struggling for game time under Xabi Alonso.