Dave, Again, I appreciate your explanations! It helps to clarify a lot. Hardcoaler, Thanks for the great pictures! Scott
Interesting this is in Seattle, trying to picture where this is in the SODO District. Look at those trucks, way different than a basic Archbar style.
That's because they aren't archbar trucks. They are "Andrews" trucks. Andrews trucks is a generic term for a truck with cast side frames that accept separate journal boxes. The cast 3 piece truck proved to be better than the fabricated archbar, but the railroads had this huge inventory of journal boxes, so they made a truck that would allow the archbar journal box to be bolted into a cast sideframe. The PRR used a custom design for their Andrews trucks. By the 1930's the journal boxes were cast intrgral with the side frames (what modelers call the "Bettendorf" truck).
