Kevin,I know lots of modelers and know of one that has DM&IR locomotives but,that's not unusual seeing he once lived along the DM&IR.
If its information you are looking for maybe these links will help.
Welcome aboard Kevin. I haven't seen many pics of DMIR modelling here but we do have a couple of Northern MN members that might have a comment or two. I'm in St. Paul too but model my childhood favorite from my years in Upstate NY.
I did a little searching and found this thread you might want to check...
I'd think it would be a great road to model. The Station Museum in Duluth has a model railroad with DMIR equipment. Been a while since I've seen it but I imagine its still there.