Yes. I was working on my module in preparation for the upcoming Boy Scout Troop 964 Show March 11-12. (see announcements). The lower level is 0-27. Usually it runs small steamers, switchers, Thomas, etc. I wondered: would a GG1 run as well? Here's the results. Similar results with both an MPC GG1 and the K-Line version. The one running is TMCC-equipped.
B&OBil