Modeling the Reading Railroad in the 1950's
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- Mark
QUOTE: Originally posted by Adelie From the text: "The S3's and S4's rode on what is commonly known as the AAR Type-B trucks, but ALCO simply calls them two axle, two motor trucks. These trucks were used on almost all of ALCO's B-B locomotives built after 1950 until the advent of the Hi-Adhesion truck (1960's)."