"Dual Control" was a term used by the National Malleable and Steel Castings Co. for describing some features of their B-1 trucks. Athearn and Kadee offer these National B-1 trucks in HO.
Railway Truck Corp. offered a variety of snubbing designs that worked with standard AAR truck side frames, so there is no one unique look. Their Snub-Up Truck Unit used a special truck bolster, as shown in the 1949-1951 CBC, but spotting features are minor.
Tahoe Model Works
Carson City, NV.