Barber S-2 trucks use built-in snubbing devices to provide a smoother ride. These are spring-loaded wedge-shaped friction shoes, located inside pockets cast into the bolster ends. These push out against the side frame columns to dampen vertical spring oscillations. Introduced in 1939, this design is still used today. Model replicates prototype trucks under a Milwaukee Road rib-side box car at the Western Pacific RR Museum in Portola, CA.
Below is a link for the data sheet about this truck.
TMW-113 / TMW-213 Data Sheet
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