Hi ccowan2126,
Open my computer and navigate to your Trianz folder.  In your trainz folder there will be a file named jetlog.txt, open this file and scroll down to the bottom, there you will see an entry like this " ?   9:57.5 : TrainzLogEnd> Averaged 55.258437fps over 485.518616sec "  That is your average frame rate and the total time you have run the last session.   The jetlog.txt file is re-written every time you run Trainz.
Cheers,
Bill69