The side clearances for through bridges carrying main line tracks may be decreased to the extent defined by a line extending from a point one foot vertically above the top of rail and five feet, nine inches laterally from the center line of track, then diagonally to a point three feet, nine inches vertically above the top of the rail and six feet, six inches laterally from the center line of track, then horizontally for a distance one foot, six inches at a height of three feet, nine inches above the top of the rail to a point eight feet from the center line of track, then vertically to conform with other sections of these regulations.
Conn. Agencies Regs. § 13b-17-166