Re: Remotoring WSM articulateds.
These large articulateds had one rigid frame engine directly attached to the boiler. and one articulated engine swinging under neath the boiler/smokebox.
Many low cost plastic/diecast models included the Broadway Limited and MTH SP Cab Forwards do not have a rigid frame engine, instead both sets of drivers
pivot under the boiler allowing these large articulateds to go around much tighter curves.
The WSM AC-4 had twin idler gearboxes with the motor shaft drivetrain up in the boiler. The gearboxes were on the second axle of each engine. The articulated
pivot point was at the end of the rigid frame engine. Since the gearbox extended up into the shell, the swing of the articulated engine interferred with the shell. By
moving the gearbox a scale 6 feet closer to the pivot point, a smaller turning radius was achieved (about 30" radius) on later WSM cab forwards.
On 2019-09-19 11:09, George Galyon via Groups.Io wrote:
HO and Sn42