Rule 8 Trustees and beneficiaries

Trustees, executors and administrators may sue and be sued on behalf of or as representing the property or estate of which they are trustees or representatives, without joining any person beneficially interested-therein, and shall be considered as representing such person, but [^f1 the judge or district judge as the case may be] may, at any stage of the proceedings, order any person to be made a party either in addition to or in lieu of the previously existing parties.

This Rule shall apply to trustees, executors and administrators sued in proceedings to enforce a security by sale or otherwise.