In the presented situation the engine will not start and you have no possibility of removing the vehicle from the track-way. Are you obliged to warn the driver of the rail vehicle of danger?

Why?

The final frame shows the car stopped on the tracks. If you cannot remove the stranded vehicle from the crossing, you must warn the train driver of the danger. Act from a safe position and make sure passengers leave the car and move away from the tracks.

art. 28 ust. 4 Prawa o ruchu drogowym