Blake, here's what I'd do if I were you. I'd send a letter, or make a phone call, to Mr. White, the GM of the railroad, and explain your interest in the Trainz, and his railroad, and in particular the locomotives, and see if you can set up an appointment to gain access to one for the purpose of making measurements, photographs, and recordings. You might have to travel to Springfield or Peoria to do it, but this is the best way to get the information you seek.
It may be that Mr. White will not be co-operative, but the worst thing that can happen is that he'll say "no", in which case you're in exactly the same situation you are not. But, if he says "yes", ...
ns
I have emailed Mr. White before about close up pictures of the SD20. The road foreman of the TZPR sent me some. But since the RS1325 is their main roadswitcher, it might be hard to set up an appointment. Plus he might also not take me seriously since I am only 13...