>Ingals had designs for a switcher, a road unit ( and built it, the 4S) and a >passenger unit. I think there was more info in an issue of the GM&O HS a few >years back. Charlie A. According to the Marre book "50 years..." Ingalls built only one of the 4S models. The proposed line included 5 different models: 4-S 1500 hp multi=purpose turret cab model sold to GM&O as #1900. 3-S 1000 hp model multi-purpose. 16-S 660 hp switcher identical to the Alco S-3. 5-S 1000 hp switcher identical to the Alco S-4. 17A An A-1-A trucked model similar to the 1946 Baldwin demos which were sold to the NeDeM as 6000-6002. Dream on, I think 3 of these would be in order, one painted in the Demo scheme, and two painted in the GM&O schemes...hosam... I have noticed a couple more additions to my previous post. The dimensions below are from Model Railroader drawings of Nov. 1951. >Here are some dimensions for the 4S: >Truck centers 32'-03" >Truck wheelbase 9'-06" >Length overall 58'-08" (coupler to coupler faces) >center front truck to front coupler face 12'-00" >height overall 15'-03"(15'-04") I read it wrong >43" wheel diameter Here are some more dimensions from the Model Railroader Cyclopedia of 1980. Truck centers 33'-00" Truck wheelbase 9'-06" Length overall 59'-01" (coupler to coupler faces) center front truck to front coupler face 13'-0 1/2" height overall 15'-00" 42" wheel diameter© S.A. McCall