Whenever to carry out any work undertaken under this chapter it is necessary to take, damage, or injuriously affect any private lands, property, or property rights, the right so to take, damage, or injuriously affect the same may be acquired by condemnation as hereinafter provided:

(1) In cases where new railroads are constructed and laid out by railroad company authorized to exercise the power of eminent domain, the right to take, damage, or injuriously affect private lands, property, or property rights shall be acquired by the railroad company by a condemnation proceedings brought in its own name and prosecuted as provided by law for the exercise of the power of eminent domain by railroad companies, and the right of eminent domain is hereby conferred on railroad companies for the purpose of carrying out the requirements of this chapter or the requirements of any order of the commission.

(2) In cases where it is necessary to take, damage, or injuriously affect private lands, property, or property rights to permit the opening of a new highway or highway crossing across a railroad, the right to take, damage, or injuriously affect such lands, property, or property rights shall be acquired by the municipality or county petitioning for such new crossing by a condemnation proceeding brought in the name of such municipality or county as provided by law for the exercise of the power of eminent domain by such municipality or county. If the highway involved be a state highway, then the right to take, damage, or injuriously affect private lands, property, or property rights shall be acquired by a condemnation proceeding prosecuted under the laws relative to the exercise of the power of eminent domain in aid of such state road.

(3) In cases where the commission orders changes in existing crossings to secure an under-crossing, over-crossing, or safer grade crossing, and it is necessary to take, damage, or injuriously affect private lands, property, or property rights to execute the work, the right to take, damage, or injuriously affect such lands, property, or property rights shall be acquired in a condemnation proceeding prosecuted in the name of the state of Washington by the attorney general under the laws relating to the exercise of the power of eminent domain by cities of the first class for street and highway purposes: PROVIDED, That in the cases mentioned in this subdivision the full value of any lands taken shall be awarded, together with damages, if any accruing to the remainder of the land not taken by reason of the severance of the part taken, but in computing the damages to the remainder, if any, the jury shall offset against such damages, if any, the special benefits, if any, accruing to such remainder by reason of the proposed improvement. The right of eminent domain for the purposes mentioned in this subdivision is hereby granted.