The police investigation is focusing on how and why the car got onto the track.
Officers are making a fingertip search of the wreckage and scene looking for clues.
The Ufton Nervet level crossing is an automatic half barrier type, typically used for minor roads.
The barriers, which are triggered by the approach of a train, only cover the oncoming traffic, leaving the exit side clear.
Automatic half barriers are the UK's most common form of protected level crossing.