A. The minimum distance between the center lines of parallel tracks shall be not less than 14 feet for main tracks and not less than 13 feet 6 inches for yard and side tracks except as otherwise provided in these regulations.
B. The center line of any track, except a main track or a passing track, parallel and adjacent to a main track or a passing track, shall be at least 15 feet from the center line of the main track or passing track. However, where a passing track is adjacent to and at least 15 feet distant from the main track, any other track may be constructed adjacent to the passing track with clearance of not less than 13 feet 6 inches.
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 the other track, except that parallel ladder tracks shall have a clearance of not less than 19 feet center line to center line.
D. The minimum distance between the center lines of parallel team, house, and industry tracks shall be not less than 13 feet.
E. Tracks constructed before July 28, 1953 may be extended without increasing distances between tracks.