Two or three years ago, I was corresponding with a company back East about “F” scale SG trucks for a diorama I was building. (I built a 40’ SG box car to interchange with a 30’ NG boxcar, both 1:20.3. After several emails and answers back, all I got was the usual “soon”.
I gave up.
My SG cars run on NG trucks for now. (Which was prototypical for some NG RRs.)
SG 40’ 1:20.3 boxcar