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and they still attacking electrical poles and lamps with this setting enabled

You should also enable the "Safety: Enable building safety" setting. In the standard Rampant, starting from version 2.0.0, this setting is removed

All lamps will become indestructible
Of all the power lines, only standard big electric pole will be indestructible. The list of safe enities is filled by name, since all electric poles (large or small) have the same type.

In addition, everything that is built before changing the setting will be attacked, but will be reborn as an indestructible object.

Regarding the railway, the settings apply to everything that has the "straight rails" type, i.e. including objects from mods