No railroad, nor any person, firm or corporation operating any railroad shall hereafter construct or erect any track, building, sign, guidepost, switch stand or structure of any kind unless there is sufficient clearance provided for the safety of any employee or servant in the normal and customary operations of such railroad or any part thereof. The State Corporation Commission may inspect any such track or structure of any railroad in this Commonwealth, and upon complaint, or on its own motion and after timely notice to the railroad company affected and a hearing thereon, by proper order or orders, may require any railroad to make such changes as may be found necessary to safeguard and preserve the safety of its employees, servants and the general public. Provided, however, that this section shall not apply to any track, building, sign, guidepost, switch stand or structure of any kind in existence prior to January 1, 1953, nor to any private or industrial siding; provided, further, however, that any private or industrial siding constructed after January 1, 1953, shall, as far as practical, conform to the foregoing provisions.