The "Focus Camera" session rule will allow you to do this. Edit the session , then select "Add Session Rules" from the menu line. Add the "Focus Camera" rule (you may need to download it first from DLS, I have been using it so long I can't remember). Select the rule, then Edit it. Specify the loco you want to be in, and Set view Mode to "Internal View". Some of the earlier (2006 era) "Set Camera" type rules no longer seem to work, but this one does.