A. A common carrier regulated pursuant to this article may authorize an agent or may join with another carrier or carriers in the publication of a joint tariff, supplement or amendment, and, where such authority is given, shall file with the Department prior to publication power of attorney or notice of concurrence, which shall specifically set out the authority given.
B. Where a carrier issues a power of attorney to an agent or a concurrence to another carrier for the publication of tariffs, such power of attorney or concurrence may not be revoked except upon sixty days’ notice to the Department and the agent or carrier to which the power of attorney or concurrence was issued, except upon special permission of the Department.