§ 125. Power of commissioner to order continuance of train service during investigation. Unless otherwise ordered or authorized by the commissioner, no railroad company shall discontinue any train engaged in the transportation of passengers in intrastate commerce within the state, except upon thirty days' notice to the commissioner and the posting of notice of such proposed discontinuance in every station directly affected thereby thirty days in advance thereof; nor, unless otherwise ordered or authorized by the commissioner, shall any railroad company discontinue any scheduled station stop by any such train, except upon fifteen days' notice and posting as herein prescribed. Upon receipt of such notice, the commissioner shall have power, upon complaint, or upon his own motion without complaint, to institute an investigation to determine whether the existing service provided by any such train is reasonably required to provide adequate transportation service. Upon the institution of such an investigation, the commissioner is authorized by order to require the railroad company to continue existing service, pending the holding of public hearings and decision thereon, provided that such order shall not be effective for a longer period than ninety days.