What does this traffic sign mean?

This traffic sign indicates necessary precautions related to overhead electrical wires and rail traffic. The components of the sign convey critical information:

1. The X shape indicates the presence of overhead electrical wires, so drivers must be cautious of the potential hazards.
2. Rail traffic is emphasized to show that it has priority over road traffic in areas where the sign is posted.
3. When approaching a rail vehicle, it's essential to stop for safety.

Understanding this combination helps ensure that drivers remain alert to both general electrical hazards and the priority of rail traffic, which is crucial for safety on the road.