(1) The minimum distance between the centerlines of parallel standard gauge railroad tracks, which are used or proposed to be used for transporting cars, engines, motors or like equipment, shall be fourteen (14) feet, except as hereinafter prescribed.
(2) The centerline of any standard guage track, except a main track or a passing track, parallel and adjacent to a main track or a passing track, shall be at least fifteen (15) feet from the centerline of such main track or passing track; provided, however, that where a passing track is adjacent to and at least fifteen (15) feet distant from the main track, any other track may be constructed adjacent to such passing track with clearance prescribed in (1) of this rule.
(3) Minimum clearances between centerlines of parallel team, house or industry tracks shall be thirteen (13) feet.
(4) The centerline of any standard gauge ladder track constructed parallel to any other track, shall have a clearance of not less than twenty (20) feet from the centerline of such other track.
(5) Existing tracks may be extended at clearances existing prior to October 27, 1978.