What actors and actresses appeared in Back Trail - 1948?

You're likely thinking of the 1948 western film "The Trail of the Yukon", which is a popular film with that thematic title. It starred:

* Randolph Scott as Steve Langdon

* Anne Jeffreys as Kathy O'Neil

* George Macready as Jake McDonald

* Robert Ryan as "Blackjack" Barnes

There is no record of a film called "Back Trail" from 1948.