The Barber S-2 70-ton Roller Bearing truck is a logical development from the original friction bearing truck first introduced in the 1940s. This truck is based on a prototype built in 1967 however, the basic design was first introduced in the late 1950s. The sturdiness of the Barber(R) S-2 truck is evidenced by the forty plus years it has rode the rails to date. A careful observer will spot these trucks in interchange use today. This truck can be used under almost any pre-1970 built 70-ton rolling stock. Self-centering action trucks self align themselves parallel with the car for easier placement on track. Mounts with a #2 or 2-56 screw. 2-piece fully equalized trucks. 1pair. Truck features: *Self centering action *Code 88 (.088) 33′ smooth back wheels *HGC weighs nearly the same as metal trucks *Superior rolling ability *Brake pads * Accurate markings *Incredible detail true to prototype *Non-magnetic metal wheels *Highly flexible fully equalized trucks *Smooth-tracking free-rolling contoured insulated axles *RP-25 free rolling wheels