Why does the rain and snow weather in the south lead to the interruption of railway transportation?

Because the humidity in the south is high, it is freezing rain, and the snow will quickly condense into ice with water vapor after landing.

In this way, even 48 cm thick icicles can be attached to the wires.

This will not happen in the north,

It hardly snows in the south. This is a natural disaster.

Therefore, the design of power system will not consider the bearing capacity of nearly 50 cm icicles.

Even in this case, the power facilities in the north will be interrupted.

The climate in the north is dry and the humidity is low, so this will not happen in the south.