52 Pa. Code § 23.14
(b) The designation on tariffs of motor carriers shall show the kind of service and serial number as follows:

The provisions of this § 23.14 amended under the Public Utility Code, 66 Pa.C.S. § 501.
The provisions of this § 23.14 amended February 6, 1998, effective February 7, 1998, 28 Pa.B. 647. Immediately preceding text appears at serial pages (213540) to (213541).
This section cited in 52 Pa. Code § 23.21 (relating to title page).