Amendment, cancellation or withdrawal of tariffs

Sec. 6. Tariff Changes. (a) Except as provided in rule 4 and unless otherwise authorized by the Commission, fares and charges which have

been filed with the Commission must be allowed to become effective and remain in effect for a period of at least 10 days before being changed,

cancelled, or withdrawn.

(b) All tariffs, supplements, and revised pages shall indicate changes from preceding issues by use of the following symbols:

• or (R) to denote reductions.

◆ or (A) to denote increases.

▲ or (C) to denote changes, the result of which is neither an increase nor a

reduction.

The proper symbol must be shown directly in connection with each change.