I tinkered with Bluerail in one of my large Factory Test steamers a while back. Even with the big areas in the steam shell and the large tender, finding the right fit for the battery, DCC card (or MTH PS3 card) plus the Bluerail / RC card takes some tinkering to get satisfactory.
I was super jazzed at first, but since our layout is still primarily DCS, we tend to forget about the Bluerail loco and charging / managing the battery tends to be a bit of a pain. It's a shelf queen for now, but maybe in the future when I have more RC equipment it'll get more play time.
Here's a thread about the install.