I took a Roberts Lines Gauge one Zephyr. . . .which was graciously given to me at an extremely discounted price from a good friend, Bob Thon. I purchased a number 9 trolley, which was produced by MTH in 2004 or 2005, pulled both under the floor motors and mounted them in the trucks of the Zephyr.
I am hoping to post some videos of the Zephyr running.
As far as I know, this may be the only operating standard Gauge Zephyr.