Overland Models' SD50/SD60
S/Sn3 Modeling Guide 1996-06
Locomotives - SD50
This is a product review of the brass locomotive.
Proto:48 A New Dimension in 1:48 Modeling
Model Railroader 1988-07
Model Railroad Terminology
This article describes the new true-to-scale Proto:48 designation, and how and why it was developed. Includes photos that show the difference between Proto:48 and normal O-scale materials.