1. (a) The minimum distance between the center lines of parallel tracks shall not be less than 13 feet, 6 inches, for main tracks and not less than 13 feet, 6 inches, for yard and side tracks, except as otherwise provided in this section.
2. (b) The center line of any track, except a main track or a passing track, parallel and adjacent to main track or a passing track, shall be at least 15 feet from the center line of such main track or passing track, except that if a passing track is adjacent to and at least 15 feet distant from the main track, such other track may be constructed adjacent to such passing track with a clearance of not less than 13 feet, 6 inches.
3. (c) The center line of any ladder track, constructed parallel to any other adjacent track, shall have a clearance of not less than 18 feet from the center line of such other track, except that parallel ladder tracks shall have a clearance of not less than 19 feet from center line to center line.
4. (d) The minimum distance between the center line of parallel team and house tracks shall not be less than 13 feet, 6 inches.
5. (e) Tracks constructed or under construction prior to the effective date of these regulations may be extended without increasing the distances between tracks.

Source

The provisions of this § 33.124 were formerly designated Section 4 by the Commission.