Summary

David Davis Knapp v. Western Vermont Railroad Company…

The position of Knapp as surviving plaintiff is very different. He is not a mere passive instrument in the litigation. On the contrary, he is active in promoting it, and would be remiss in his duty if he failed in using all proper means to bring it to a successful issue. As the cause of action is vested in him the court looks to his citizenship in determining the question of jurisdiction, and not to the residence of those persons who are beneficially interested in the subject-matter of the litigation.
Source: Wikisource

David Davis Knapp v. Western Vermont Railroad Company…

In a court of law legal rights alone can be recognized, and in determining the point of jurisdiction, we will not make inquiry outside of the case in order to ascertain whether some other person may not have an equitable interest in the cause of action.
It is conceded on the argument that Knapp and Briggs were trustees of a mortgage upon the property of the Western Vermont Railroad to secure the bonds of the company, and that upon a strict foreclosure of the mortgage their title became absolute in trust for the bondholders.
Source: Wikisource

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