No land shall be taken without the consent of its owner, except within two years after the approval of the location of the route by the Commissioner of Transportation. When the land of any infant, cestui que trust or person non compos mentis is necessary for the construction of a railroad, such land may be taken on giving notice to the trustee of such cestui que trust, the guardian, either natural or appointed, of such infant or the conservator of such person non compos mentis, who may give a release for all damages for lands so taken, as fully as if the same were held in his own right.