Turbo Train 66 arrived today and was immediately placed into revenue service (read You Tube video uploads) on the layout! I have liked the looks of this train ever since it was new more than 40 years ago. After connecting the train up, it started right off under command mode. Initially, I ran it around 20 mph due to the report of derailments on O72. My track setup is RealTrax with O72 curves. I did not encounter any derailments so speed was increased to 70 and 80 mph without any issues. The videos show it handling the track and curves well. Clearance is tight on O72 because the locomotives and cars are scale length and their corners nearly touch. I would not try this train on less than O72. The box says O72 at a minimum and there is a reason manufacturers specify curvature. I will offer up these videos for initial operating characteristics. More video is available on my You Tube channel. The only operational issue I encountered was the separation of the electronic connection between the lead locomotive and the car. It happened infrequently but did occur several times over a couple of hours of operation. At least one time was due to my not securely fastening the connection but the other times could have been caused by the tight radius O72 curves for this train. It should run great on larger radius curves and it runs very well at slow speeds.